Human Excretory System
Here we have Ketill Bjarnarson, called Ketill Flatnefur, meaning he had a flat nose, so he may have broken it in a fight or something. It can cause diarrhoea. So if there's going to be an effective treatment for Riley, instead of fixing his genes, we're going to take a look—and this is new territory—at his proteins. You know people have known for years that your kids look a lot like you. So you're sitting there thinking there must be a better way when you're gazing out the window? They're going to be, you know, celebrities.
Nutrition in Human Beings – NCERT Solutions for Class 10 Science
Younger elementary school students might think that the contents of the body is what they have seen being put into it or coming out of it. Students know food is related to growing and being strong and healthy, but they are not aware of the physiological mechanisms. In upper elementary, students can list a large number of organs and by 5th grade, "students know that food undergoes a process of transformation in the body.
Students should naturally begin talking about the digestive system in response to the final question listed above. Let them know that food and the digestive system are the topics for this lesson. Once students have done some preliminary exploration of the digestive system, ask these questions:. Next, brainstorm answers to these questions.
There are many answers, many of which are not very obvious, but this will get students thinking beyond the basic processes of the digestive system. Depending on your students' ability, this article can be read online or printed out and read in class. Also, it is not necessary to click on the links within the text for this lesson. Provide students with the Digestive System student sheet.
They should get into groups and cut out parts of the digestive system from colored construction paper as they make their way through the article. On each organ, students can write a one- to two-sentence description of the organ's purpose.
In the end, they will have a recreated digestive system of their own. My Aim in Life Aimless life is certainly a sin. They are like the travelers going a head with About Me Kawish Hassan View my complete profile.
It has both openings, mouth and anus. It opens into oral cavity. Lips close the mouth. Lips also help in ingestion. Tongue forms floor Palate forms roof Jaws form roof boundary of mouth. Both jaws bear teeth. It consisting of 8 incisors, 4 canines, 8 premolars and 12 molars. Incisors are cutting and biting teeth.
Their flat sharp edges cut food into smaller pieces. Canines are pointed teeth and poorly developed in humans. They are used in tearing, killing and piercing the prey. Premolars and Molars are grinders and used for crushing the food.
Mastication increases surface are of food for action of enzymes. If one attempt to swallow a food particle too large to enter ocsophagus, it may block the trachea and may stop ventilation. Calcified plaque forms dental calculus. Continuous inflammation may spread to the root of tooth and destroy peridental layer.
Eventually tooth becomes loose and falls off or may have to be extracted. When dentine and pulp are attached, produce toothache and loss of teeth. Taste buds are most numerous on sides of vallate papillae. They are absent on mid dorsal region of oral part of tongue. It mixes the masticated food with saliva 3.
It helps in swalloing 4. It helps in sucking and testing food. It is supplied by IX cranial nerve. Supplied by VII cranial nerve. These glands are supplied by Parasympathetic Nervous System. Fibers of parasympathic N. S lie in Cranial nerves. These nerves increase their secretion. Mucous of Saliva moistens and lubricates the food particles prior to swallowing.
Salivary Amylase or Ptylin begins digestion of starch, first to dextrins and then to maltose dissacharide. Lysozyme destroys the oral cavity pathogen bacteria. It has a cleansing action. Water in Saliva, dissolve some of the molecules in food particle then they react with chemo receptors in taste buds, giving sensation of taste, hence, the H2O enables taste buds to respond. Saliva is fully saturated with calcium and this prevents decalcification of teeth. Saliva makes speech possible by moistening the mouth; it is not possible to talk if the mouth is dry.
It acts as a lubricant and enables a bolus a rounded mass of semi-solid, partially digested food particles stick together by mucus to be formed. The tongue pushes bolus into pharynx. As the bolus of food moves into the pharynx, the soft palate is elevated and lodges against the back wall of pharynx sealing the nasal cavity and preventing food from entering it.
The swallowing center inhibit respiration, raises the larynx and closes the glottis opening between vocal cords , keeping food from getting into trachea. As the tongue forces the food further back into the pharynx, the bolus tilts the epiglottis backward to cover the closed glottis. This pharyngeal act of swallowing lasts about 1 second. It connects pharynx to stomach. It passes through the thoracic cavity and penetrates the diaphragm, then it joins the stomach a few cms below the diaphragm.
Lower two-third is surrounded by smooth muscles. Skeletal muscles, just below pharynx surrounding oesophagus form Upper Oesophageal Sphincter. Smooth muscles in last 4 cm of oesophagus forms Lower Oesophageal Sphincter. It seals the exit of food. It is the basic propulsive movement of GIT. Bolus is moved toward stomach by progressive peristaltic wave which compresses the lumen and forces the bolus ahead of it.
Vomiting begins with a deep inspiration, closure of glottis and elevation of soft palate. Abdominal and thoracic muscles contract, raising intradominal pressure.
It has muscous glands which helps in lubrication of food. Body of stomach contain gastric glands. Gastric glands contain 3 types of cells. It lubricates the food and passage.
It also protects the epithelium from self digestion by pepsin. Kills microbes Solublization of food particles. Avocados are rich in healthy fats, as well as B vitamins, vitamin K, and vitamin E and have a very high fiber content. Studies have shown that regular avocado consumption lowers blood cholesterol levels.
Avocado extracts are currently being studied in the laboratory to see whether they might be useful for treating diabetes or hypertension. Researchers from Ohio State University found that nutrients taken from avocados were able to stop oral cancer cells, and even destroy some of the pre-cancerous cells.
Studies have shown that a high intake of dark-leafy vegetables, such as spinach or cabbage, may significantly lower a person's risk of developing type 2 diabetes. Researchers at the University of Leicester said that the impact of dark green vegetables on human health should be investigated further after they gathered data from six studies.
They reported their findings in the BMJ. Spinach, for example, is very rich in antioxidants, especially when uncooked, steamed, or very lightly boiled.
It is a good source of vitamins A, B-6, C, E, and K, as well as selenium, niacin, zinc, phosphorus, copper , folic acid, potassium, calcium, manganese, betaine, and iron. Sweet potatoes are rich in dietary fiber, beta-carotene vitamin A , potassium, vitamin C, and vitamin B The Center for Science in the Public Interest compared the nutritional value of sweet potatoes to other vegetables.
The sweet potato ranked number one, when vitamins A and C, iron, calcium, protein, and complex carbohydrates were considered. When looking for healthy protein, it is difficult to know which is the best source. Here are some of the best:. Examples of oily fish include salmon, trout, mackerel, herring, sardines, and anchovies. These types of fish have oil in their tissues and around the gut.
Their lean fillets contain up to 30 percent oil, specifically, omega-3 fatty acids. These oils are known to provide benefits for the heart, as well as the nervous system. Oily fish provide benefits for patients with inflammatory conditions, such as arthritis.
They are also rich in vitamins A and D. Scientists at UCLA's Jonsson Comprehensive Cancer Center found that prostate cancer progression was significantly slowed when patients went on a low-fat diet with fish oil supplements.
As a white meat, chicken can be consumed much more freely than other red meats such as beef, which can have a more damaging long-term impact on overall health. It is important to remember that the preparation and cooking of chicken has an impact on how healthy it is. This means deep-fried chicken should be limited or avoided. It's also important to remove the skin, as this part of the chicken contains high levels of fat.
Eggs are another source of protein that can easily be incorporated into a balanced diet. Being very versatile, they can be added to many meals - not just breakfast. They contain other vitamins, including vitamin B-2, also known as riboflavin, and vitamin B, both of which are important for energy and red blood cells. It is also a good source of the essential amino acid leucine, which is important for stimulating muscle protein synthesis.
The yolk of the egg contains the majority of the vitamins and minerals. It also contains the fat and cholesterol, however, research has shown that eggs do not increase the risk for heart disease. Consuming fat in moderate amounts is perfectly healthful.
Overall it is important for health to have a balanced diet and one that does not focus on one specific type of food. It's also important to remember that a treat once in a while can be a part of a balanced diet, and one that is very healthful overall. We picked linked items based on the quality of products, and list the pros and cons of each to help you determine which will work best for you. We partner with some of the companies that sell these products, which means Healthline UK and our partners may receive a portion of revenues if you make a purchase using a link s above.
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