Question

1. Gastrin is secreted by;

1. Small intestine
2. Liver
3. Pancreas
4. Stomach

2. Hormone secretin:

1. Converts trypsinogen to trypsin
2. Stimulates release of pancreatic juices
3. Inhibits release of pancreatic juices
4. Stimulates secretion of bicarbonate from pancreas into duodenum

3. ____________is a proteolytic enzyme in pancreatic juices:

1. Trypsin
2. Amylase
3. Nuclease
4. Gastrin

4. Chief cells of stomach epithelium secretes:

1. Pepsinogen
2. HCl
3. Mucus
4. Gastrin

5. Fats, proteins and carbohydrates are digested in:

1. Small intestine
2. Stomach
3. Liver
4. Large intestine

6. Pyloric sphincter connects ___________ to ____________:

1. Small intestine; large intestine
2. Esophagus; stomach
3. Stomach; small intestine
4. Liver; gall bladder

Answer 1

1. d) Stomach.

Gastrin is directly responsible for the release of gastric acid, it is a digestive hormone which is secreted by the wall of pyloric end of stomach and helps in gastric motility. Gastrin is released into the bloodstream when food enters the stomach.

2.d) stimulates secretion of bicarbonate from pancreas into duodenum

Secretin is synthesized and secreted by S cells in the small intestine and secretin is released in response to acid in the small intestine, and stimulates the pancreas and bile ducts to release bicarbonate which functions to neutralizes the acid.

3. a) trypsin.

Pancreatic juice is a liquid secreted by the pancreas, two major proteolytic enzyme produced by the pancreas include trypsin and chymotrypsin

4.a) Pepsinogen

Pepsinogen is converted into pepsin in presence of HCL.. HCL is secreted by parietal cells.

5) a) Small intestine

Digestion of carbohydrates begin in the mouth. in the small intestine carbohydrates are broken down into sugars, fats into fatty acids and glycerols and protein into amino acids.

6) c) stomach and small intestine

Pyloric sphincter is a ring of smooth muscle, It opens and closes to control the passage of partially digested food and stomach juices from the pylorus to the duodenum.