Functions in the Human Body

Functions in the Human Body Part A Digestive System The digestive system is the system of organs that takes food in, the digestive system is a set of organs that transforms whatever we eat into substances that can be used in the body for energy, growth and repair. The main functions of the digestive system are ingestion, digestion, absorption, and defection. Ref: (Class Notes 2015) Explain the functions of each part of the digestive system identified in the diagram above? The Mouth The mouth is the first portion of the alimentary canal that receives food and saliva. The oral mucosa is the mucous membrane epithelium lining the inside of the mouth. The tongue is a muscular organ and has many taste buds, which are accountable for the tastes: sweet, sour, bitter and salt. You would get a range of different flavours as the tongue moves the food around the mouth. The food in your mouth moves from tooth to tooth to have it made into a pulp with the aid of saliva. The tongue would then pass the pulp (bolus) down the throat. There are four types of teeth. Individually they have their own functions in the breakdown of food. The first would be the incisors, there are four in each jaw. They are sharp, chisel shaped teeth that are used for cutting and biting. Next to these on both sides are the canines, canines are cone shaped teeth frequently called the eye-tooth. They have a sharp point and you would use them to tear food. There’s to in each jaw. Next are the premolars, there are four of them in each jaw, they would be used for crushing and crunching of food. There blunt broad teeth with two sharp ridges. Molars are similar to premolars and are six to each jaw, they are also blunt broad teeth but have a larger surface area. Each has four surface points. The salivary glands there are three parts of the salivary gland you have the parotid gland that is situated below the ear, the submandibular and the sublingual gland, they are situated below the tongue. Liquid called saliva is secreted from them. It contains water, mucus and the enzyme salivary amylase. The function of saliva is to lubricate the food with mucus, making it easier to swallow. The Oesophagus It’s a muscular tube that leads from the pharynx to the stomach. The food moves through it by a muscular contraction known as peristalsis. It’s part of the digestive system. It is the tube that carries food from your mouth to the stomach. The muscles contract and relax creating a wave like motion on the tube. The lining of the oesophagus secretes mucus to ease and oil the passage of food. Once food touches the end of the oesophagus it presses against the cardioesophageal sphincter. The Stomach The stomach is a C-shaped elastic sac. The wall of the stomach is a grouping of layers of muscle fibre with an inner mucous membrane. The mucous membrane has a lot of doublings called rugae. When the stomach is full is will stretch out allowing expansion, then it would contract when it empties. When the stomach is full it can hold up to approx. 4 litres (1 gallon) of food. The Liver The liver has numerous functions, its main function inside the digestive system is to process the nutrients absorbed from the small intestine. Bile from the liver secreted into the small intestine also plays a significant role in digesting fat. The liver only makes bile. The Gallbladder The gallbladder is a pear-shaped deep structure located under the liver and on the right side of the abdomen. Its main function is to store and concentrate bile, a yellow / brown digestive enzyme formed by the liver. The gallbladder is part of the biliary tract. The Pancreas The pancreas is a greyish pink gland organ it’s placed in the upper abdomen, it lies behind the stomach and intestines (guts). It is roughly the size of a hand. The pancreas has to major functions, one of them is to make digestive enzymes which help us to digest food. Enzymes are special chemicals which help speed up your body’s processes. The second one makes hormones which regulate our metabolism. Hormones are chemicals that can be released into the bloodstream. The Large Intestine The large intestine is a thick tube that’s approximately 1.5 metres (5 feet) long it receives waste from the small intestine, it hangs around the small intestine in an arch shape. It involves the caecum, colon, rectum, and the anal canal. The colon holds bacteria which breaks down any remaining food and makes some significant vitamins. It also deals with waste within the body. Small Intestine The small intestine is approximately six metres (18 feet) long. 90% of the digestive process takes place here in the small intestine. It’s a coiled tube that has three parts which are the duodenum, jejunum, and the ileum. The wall of the whole of the small intestine is significantly folded, each of the villi contains more projections called microvilli that absorbs food and passes it onto the capillaries. Muscles of the walls contract and relax so that the villi sway about. Appendix The appendix is a narrow tube attached to caecum and it is about 9 cm long. The appendix is not a vital organ you can live without it. The appendix sits at the junction of the small intestine and the large intestine, the appendix sits in the lower right abdomen. The function of the appendix is unknown. A theory is that the appendix acts as a storehouse for good bacteria â€Å"rebooting† the digestive system after diarrheal illnesses. Rectum The rectum is a short straight section of the alimentary canal, it leads from the colon to the anus and thus to the outside world. A human rectum is approximately 12cm long.The rectum is a chamber that begins at the end of the large intestine. It is usually empty only receiving the contents of the colon called faeces when they are ready to be passed out of the anus. The Anus The anus starts at the bottom of the rectum. The anorectal line separates the anus from the rectum. Tissue called fascia surrounds the anus and joins it to nearby structures. Circular muscles named the external sphincter form the wall of the anus and hold it closed. The glands in your body discharge fluid into the anus to keeps it surfaces moist. Outline the composition of Proteins, Fats and Carbohydrates, and explain how each of them are digested and absorbed by the body. Proteins, fats and carbohydrates are all in the body. Protein helps the body to grow, it builds muscle and gives you energy. Protein accounts for 16% of a person’s total body weight the reason for this is because connective tissue, skin, hair and muscle are all made up from protein. Carbohydrates are sugars the body uses for energy, simple carbohydrates give the body quick energy. Fat is also another way it helps the body grow, your body needs fat to process vitamins. Polyunsaturated and monosaturated fats are good for your body. Source Function Digestion Proteins Fish Red Meat Beans Dairy Products The functions of protein are to help the body to grow and repairs any damage done to your body .i.e. Cuts. The Stomach – the enzymes pepsin begins the digestion of proteins in the stomach breaking it down into large polypeptides. The Small Intestine- enzymes from the pancreas, trypsin, and chymotrypsin break the large polypeptides into smaller chains. Finally the small intestine breaks up the small polypeptides into individual amino acids ready for absorption. Fats Dairy Products Meat Olive oil Avocados Sunflower oil The functions of fat are to help the body grow. In the small intestine, fat are emulsified by bile salts from the liver. Lipase from the pancreas breaks down fat into fatty acids and glycerol ready for absorption. Carbohydrates Rice Potatoes Pasta Cereals Flour The functions of carbohydrates are a release of energy Salivary amylase creates the breakdown of polysaccharides in the mouth. Part B Draw a diagram of a typical cell, and state the function of each of its organelles? Cells are the most important units of life. Our bodies contain over 100 trillion cells, they do everything in a human body from providing structure and stability to providing energy and a means of reproduction. Ref: (Class Notes 2015) Cell membrane The cell membrane forms the outer edge of the cell and allows certain materials move in or out of the cell. Cytoplasm Cytoplasm is a gel-like material inside the cell that contains water and nutrients for the cell. Nucleus The nucleus directs the activity of the cell and contains chromosomes with DNA that contains all genetic information. Nuclear Membrane Nuclear membrane separates the nucleus from the cytoplasm. Ribosomes Ribosomes make protein for the cell. Golgi Body Golgi bodies are used in the cell for packaging and secreting of energy. Lysosomes Lysosomes are chemicals that are used to digest waste. Vacuoles Vacuoles are storage areas for the cell. Mitochondria Mitochondria breaks down food and releases energy to the cell, it’s like a powerhouse as it provides the cell with energy. Endoplasmic Reticulum Endoplasmic Reticulum moves materials around the cell. Classify tissues into the four main groups; epithelial, connective, muscle, and nervous, give an example of each? (Table format will suffice) There are four main tissue groups within the body, there are some functions and examples below for the four main groups of tissue within the body. All four cells work together in the body. Type Of Tissue Function Example Epithelial The functions of the epithelial are that the epithelial cell from the skin protects underlying tissue from injuries, harmful chemicals, invading bacteria and excessive loss of water. A sensory stimulus penetrates specialised epithelial cells. Epithelial tissue is widespread throughout the body and aid protection absorption and secretion, it’s made of closely packed cells. The cells are arranged in continuous flat sheets. They form the covering of all body surfaces. Connective The function of the connective tissue is to join bodily structures like bones and muscles together and it holds the tissue together in their place. Connective tissue connects all other tissues in the body. It consists of many different types of cells in the body and is surrounded by non-living fluid. Muscle The functions of muscle tissue are that muscle tissue is a soft tissue that composes muscles and provides rise to muscles. Muscle tissue varies with function and location in the body. Muscle tissue is tissue that contracts and relax there are 3 types in the body, the skeletal muscle tissue, smooth muscle tissue and cardiac muscle tissue. Nervous The functions of nervous tissue are to form communications network of the nervous system by conducting electric signals. The nervous tissue forms the organs of the nervous system it’s made up of a special kind of cell called a neuron it’s also called a nerve cell. Nerve cells are long and narrow. A human has 100 billion nerve cells. Ref: (Class Notes 2015) (www.google.co.uk) Explain the difference between benign and malignant tumours? A tumour develops when a group of cells escape from their normal orderly process of cell division and they begin to multiply in an uncontrolled way, after a while plenty of these abnormal cells will be produced to form a lump, that is called a growth or a tumour. Two important differences between benign and malignant tumours are invasion and spread. Benign Benign tumours do not spread they can grow to a very large size, but it wouldn’t go to other parts of the body. Benign tumours push the surrounding normal tissues and organs out of their way. Occasionally pressure from a benign tumour could damage surrounding structures but the benign tumour never invades into those structures. There are several hundred different types of benign tumours that can develop in our bodies. Malignant Malignant Tumours have the power to spread by sending off seelings of tumour which can pass through the blood or lymphatic system to other parts of the body. The Seedlings would then settle in other organs and form what are called secondary tumours or metastases. A malignant brain tumour is a fast-growing cancer that spreads to other parts of the brain and spine, brain tumours are graded between 1 and 4, and a malignant brain tumour is either grade 3 or 4. Most malignant tumours are secondary cancers that mean it starts in one part of the body and spreads to the brain. The primary tumours are the ones that start in the brain. The word cancer only relates to malignant tumours. With malignant tumours it eats away and destroys the normal tissue around the affected area in which it has started off at. The difference between benign and malignant tumours is that a benign tumour is non-cancerous were as a malignant tumour is cancerous. If has nothing to do with frequency in some of the organs of the body, benign tumours can be very large in size were a cancerous tumour can be very small. Ref: (Class Notes 2015) (www.google.co.uk) Part C Label the urinary system using the diagram overleaf. The urinary system is one of the human’s body’s waste disposal units and its filtration unit. It contains the kidneys, ureters (tubes connecting the kidneys to the bladder), the bladder and the urethra. The urinary system helps empty the body from potentially harmful waste substances like urea and alcohol. It does this through filtration and excretion. Explain the structure and function of each element of the urinary system? The urinary system consists of the kidneys, the ureters, the bladder and the urethra. The major function of the urinary system is to get rid of all waste products and excess fluid from the body. The kidneys are the main organs of the urinary system. The urinary system produces a hormone which is responsible for controlling the rate at which red blood cells are made and an enzyme is responsible for controlling blood pressure. Inside each kidney there are approximately 1 million tiny nephrons, they are the units that clean the blood. All of the functions are needed for helping the body to maintain homeostasis also known as balance. Urinary System Structure Function Kidneys The structures of the urinary system are the kidneys, ureters, bladder, and the urethra they all work together in the body. The kidneys are dark red, bean-shaped organs, it’s about 11cm long Inside each kidney there a 1 million tiny nephrons. The functions of the kidneys that they filter blood in order to get rid of wastes and excess water. The waste and water would be excreted as urine. The kidneys filter about 200 quarts of blood a day and produces about 2 quarts of waste and extra fluid. Ureters The structure of the ureters is that the ureters are tubes made up of smooth muscle fibers that propel urine from the kidneys to the urinary bladder. The functions of the ureters is that the ureters is the tube that carries urine from the kidneys to the bladder, all humans have two ureters one is attached to each kidney. Bladder The structures of the bladder is that sometimes it’s called the urinary bladder it’s a sac-like organ in the pelvic cavity. The functions of the bladder are the bladder is a reservoir for urine. The bladder has an internal sphincter that relaxes when the walls contract, thus opening and emptying the urine into the urethra. Urethra The structure of the urethra is that it’s a narrow tube passing from the bladder to the outside of the body. It’s shorter in women making them more susceptible to infection. The function of the urethra is to take urine from inside the body (the bladder) to outside. In men the urethra is the passage for semen. Ref: (www.google.co.uk) (Class Notes 2015) Draw the structure of a nephron and explain how it produces urine? A nephron is an important functional part of the kidneys. Both kidneys have around a million minute nephrons. Nephrons reside in the cortex and medulla it produces urine from filtrate, filtrate is the fluid that remains in the nephron after filtration its then removed from the bloodstream passing it to the bladder, a nephron is an intricate structure in the body it serves two purposes it filters and removes waste products and maintains the body’s water supply. Ref: (Class Notes 2015) Name and explain three diseases / disorders which affect the urinary system? There are a lot of diseases and disorders that affect the urinary system in different ways. Kidney Stones Kidney stones are deposits of substances found in urine and would form solid stones in the renal pelvis, bladder or the ureters. It can be extremely painful and if they needed removing it would be done by surgery. Glomerulonephritis Glomerulonephritis is a type of glomerular kidney disease in the kidneys the filters become inflamed and scarred and would slowly lose their ability to remove waste and excess fluid from the blood to produce urine. Cystitis Cystitis is an inflammation on the bladder and would cause a person pain when passing urine. Sometimes it’s caused from infection. It’s very common in women because of the part of the shorter length of the female urethra. Ref: (Class Notes 2015) Nicole O’Brien

Nathaniel Abraham :: essays research papers fc

Nathaniel Abraham was eleven years old when he committed the act of murder. Under a 1997 Michigan law a child of any age may be tried as an adult for severe crimes. Abraham was the first juvenile to be tried under this statute. Accused in the murder of Ronnie Lee Greene Jr., Abraham faced first degree murder charges. Now, at the age of fourteen, Nathaniel has been sentenced to a juvenile facility until the age of twenty-one. Oakland County Probate Judge Eugene Moore hopes that rehabilitation will put an end to Nathaniel’s criminal activity. Nathaniel, a black youth from the slums of Pontiac, Michigan, grew up with out a father, or a strong family unit. He, in turn, never learned the responsibility of his actions; he was not privy to an upbringing that reinforced positive ideals. Crime & Criminology describes, in depth, the relation between family and criminal activity in youths. Page 126 (chapter four) sited two relevant facts; 1) Blacks have much higher rates of illegitimacy and female headed house holds. 2) Blacks have a much higher rate of crime than their white counterparts. In Nathaniel’s case, it can be said that his lack of a positive role model, or father figure lead to his involvement in criminal activities. His mother, Gloria, was struggling to raise three children by herself. Nathaniel’s father had left when he was born, leaving her with no one to depend on. The family moved in with an older couple who offered to help them. With limited supervision Nathaniel was a constant source of aggravation for his mother. Police reported that Nathaniel was suspected in over 22 local crimes, ranging from assault to armed robbery. He, in fact, had been arrested five days before Greene’s murder on the charge of robbery. All this by the age of eleven. In families where there is no male role model a child is far more likely to become involved in crime. The data that exists suggests a direct correlation between youths raised without a fathe r and criminal activity.

Perfect Competition Essay

The spectrum of market structures varies diversely from highly competitive markets where there are a large number of buyers and sellers, each of whom having little or no power to alter the market price to a situation of pure monopoly where a market or an industry consists of one single supplier who enjoys considerable control over the market price, unless specific restrictions are placed directly by the government. A market structure such as the Chicken Meat Industry can be deemed as â€Å"Perfect Competition (PC)† as it fulfills the following mentioned assumptions: 1. There are many producers in the economy as mentioned in the question.   2. Each individual firm in the market is a Price Taker- the firms cannot control the price of chicken being sold in the market instead they have to simply accept the designated going market rate as the price of their product. This happens due to two major characteristics of Perfect Competition: a. As there are a large number of suppliers, each of them has a relatively small share of the overall market. As a result, these individual firms are unable to affect price by directly bringing about a change in its own supply because by assumption, each firm is small in size b. Due to the enormous competition faced by each firm, no single firm can increase the price that it charges above the price charged by the other firms in the market without losing business caused by a large substitution effect away from that firm 3. All firms produce identical goods, as in the case of Chicken Meat Industry where the product i.e. chicken is homogenous. The characteristics of chicken do not vary much from supplier to supplier as a result they are substitutes for each other. 4. Buyers are perfectly aware of the nature and quality of chicken being sold to them as well as being well informed about the price being charged by each seller. 5. All firms, present and future, are assumed to have equal access to all factors of production as well as any advancement in technology in the production process. 6. The chicken meat industry is characterized by freedom of entry and exit. There are no barriers to entry or exit of firms in long run as a result the present the market will always be open to competition from new entrants. 7. â€Å"No externalities in production and consumption so that there is no divergence between private and social costs and benefits†. (tutor2u.net) Market Analysis Short Run We know that Economic Profit is the difference between the Total Revenue (TR) and Total Cost (TC) where TC consists of both explicit and implicit costs. As Opportunity costs are the next best alternative forgone, a chicken meat supplier can have can have a significant accounting profit with little to no economic profit. In the Short Run, economic profits for individual chicken meat suppliers depend on the position of their Average Total Cost curves. (investopedia.com) In the short run the equilibrium market price, P1 is determined by the interaction between market demand and supply. This price is taken by each of the firms as their selling price which in turn is constant for each unit sold. Therefore, the AR curve also becomes the Marginal Revenue curve (MR). We know, a firm maximizes profits when marginal revenue = marginal cost, therefore the profit-maximizing output for a given firm is Q1. The firm sells Q1 at price P1. Because the ruling market price is greater than the Average Total Cost (P>AC), the firm will make positive economic profit as indicated by the shaded area below.

The Behavioral Theory Of Psychology - 863 Words

Behavioral perspective is through reinforcement, which is the idea that patterns of emitted behavior can be selected by their consequences. In the early 1900’s, a group of individuals emerged as behaviorists who disagreed upon the idea that if psychology was to be a science, then it must focus on events, which are directly observable on behavior, rather than on mental life. This prompted a new era in exploration by promoting the behaviorists idea that psychology should be approached with the idea that the environment or events triggered the way an individual acts. Essentially, behavioral perspective emphasizes an observable behavior and how it goes â€Å" hand-in-hand† with environmental events that truly mold a person. That being said, in order mold individuals with this theory, people must introduce this concept to babies as that time in development is a key determining factor of how they will act as adults. One of the earlier supporters of behavorialism was John B. Watson, who prompted the behavioral approach into present day psychology. John B. Watson was born on January 9, 1878 in South Carolina. His mother, Emma, was devoutly religious and named him after a Baptist minister in the hope that he would join the clergy. Emma disavowed smoking, drinking, and other vices, but Watson grew into an adult who openly opposed religion John s father, with whom he was closer, did not follow the same rules of living as his mother. He drank, had extra-marital affairs, and left in 1891.Show MoreRelatedThe Behavioral Theory Of Psychology1614 Words   |  7 PagesBEHAVIOURAL APPROCH IN PSYCOHOLOGY. IDENTIFY HOW THE BEHAVIOURAL APPROACH WILL EXAMINE DEPRESSION AND HOW THIS VARIES FROM A BIOLOGICAL APPROACH The behavioural approach in psychology, how it examine depression and it varies from the biological approach. 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