Short answer type question :
1.(a) what is the role of mucus in stomach.
(b)what is the role of hydrochloric acid in stomach
2. What is alimentary canal? Name the various parts of alimentary canal and the associated glands.
3. Which part of the alimentary canal is involved in :
a.absorption of food?
b. Chewing of Food?
c. Killing of bacteria?
d. Complete digestion of food
e. Formation of faeces?
4. Which organ of the body secretes bile? Where is bile stored? What is the function of bile in the digestion of Food?
5. What are villi? Where are villi located? What is the function of villi?
Long answer type question :
1. What is meant by tooth decay? Name some of the foods which are the major cause of tooth decay. What are the various ways of preventing tooth decay?
2. What is meant by digestion? Name the various organs of the human digestive system. Also name the associated glands.
3. Name three things secreted by the inner lining of our stomach. Also state their functions. What is the function of large intestine?
5. What are incisors, canines, premolars and molars? State their functions.
Class - 7
Answers
Answer:
1. (a) Gastric mucus is a glycoprotein that serves two purposes: the lubrication of food masses in order to facilitate movement within the stomach and the formation of a protective layer over the lining epithelium of the stomach cavity.
(b) Stomach secretions are made up of hydrochloric acid, several enzymes, and a mucus coating that protects the lining of your stomach. Hydrochloric acid helps your body to break down, digest, and absorb nutrients such as protein. It also eliminates bacteria and viruses in the stomach, protecting your body from infection.
2. The various parts of the alimentary canal includes mouth, teeth, esophagus, pharynx, stomach, small intestine (duodenum, jejunum and ileum), large intestine, anus. Digestive glands includes salivary glands, pancreas, liver, gastric glands and intestinal glands.
3. Chewing of food, absorption of food and complete digestion of food
4. gallbladder
Bile is a fluid that is made and released by the liver and stored in the gallbladder. Bile helps with digestion. It breaks down fats into fatty acids, which can be taken into the body by the digestive tract.
5. Villi are small finger-like projections found inside the inner walls of the small intestine. They v increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface.
LONG ANSWERS
1. Tooth decay occurs when foods containing carbohydrates (sugars and starches), such as breads, cereals, milk, soda, fruits, cakes, or candy are left on the teeth. Bacteria that live in the mouth digest these foods, turning them into acids.
2. The digestive system in human beings consists of alimentary canal and associated digestive glands. The alimentary canal consists of mouth, oesophagus, stomach, small intestine, large intestine and anus. The associated glands consist of salivary glands, liver, pancreas, gastric and intestinal glands
3. While storing the food, the stomach also secretes mixture of acid, mucus, and digestive enzymes which help in digesting the food. Throughout the stomach lining, mucous cells are found which secrete mucus. Mucus is also secreted by the gastric pits which are small pores.
5. Incisors are the teeth that you use to bite into your food. Canines - Your canines are the next teeth that develop in your mouth. You have four of them and they are your sharpest teeth, used for tearing apart food. Premolars - Premolars are used for tearing and crushing food.
Explanation:
Answer:
it's hard question I can't answer sorry