Question
The activities of the digestive system are regulated by A) the contents of the digestive tract. B) intrinsic nerve plexuses. C) parasympathetic and sympathetic neurons. D) hormones. E) all of the above Which of the following is false about secretions from the salivary glands? A) help control bacterial populations in the B) contain enzymes for the digestion C) contain enzymes for the digestion of polysaccharides D) are mostly water E) help lubricate the oral cavity and its contents Functions of the stomach include all of the following, except A) absorption of triglycerides. B) initiation of protein digestion. C) denaturation of proteins. D) storage of ingested food. E) mechanical breakdown of food. Parietal cells secrete A) hydrochloric acid. B) pepsinogen. C) gastrin. D) mucus. E) enteropeptidase. The part of the stomach that functions as a mixing chamber for food and secretions is the A) pylorus. B) body. C) antrum. D) fundus. E) cardia. The prominent ridges in the lining of the empty stomach are called A) papillae. B) cardia. C) plicae. D) rugae. E) villi Plicae and intestinal villi A) carry products of digestion that will not pass through the walls of blood capillaries. B) secrete digestive enzymes. C) increase the surface area of the mucosa of the small intestine. D) produce hormones. E) produce new cells for the mucosa of the small intestine. The duodenal ampulla receives secretions from the A) common bile duct and the pancreatic duct. B) duodenum and the pancreatic duct. C) duodenum and the pylorus. D) duodenum and the jejunum. E) duodenum and the bile duct.
Explanation / Answer
20. Digestive system is composed of various organs which actively participate in digestion of food. Digestion starts from mouth and continues till large intestines; during this process several hormones and nerve reflexes take part to regulate digestion.
So the correct option is (E) All the above.
21. The secretion of salivary gland includes saliva which contains enzyme ptyalin which is helpful in breaking down starch into simple sugars.
So the correct option is (B) contain enzymes for the digestion of disaccharides.
