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Answers
Answer 26 (a) :- The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion. The pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.
Answer 26 (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.
Answer 27:- Alimentary canal passes the whole passage along which food passes through the body from mouth to anus during digestion. The various parts of the alimentary canal includes mouth, teeth, esophagus, pharynx, stomach, small intestine (duodenum, jejunum and ileum), large intestine, anus. Associated glands includes salivary glands, pancreas, liver, gastric glands and intestinal glands.
Answer 29 :- The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.
Answer 31 :- Bile is secreted by the liver, stored in the gallbladder & contains bile salts. The primary function of bile salts is to emulsify fats in order to facilitate their further breakdown by pancreatic enzymes. Bile also aids in fat absorption & plays a role in neutralizing gastric acids in the small intestines.
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Answer:
1.digestion of starch in the stomach takes place in small intersine
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planation: