Question

Which of the substances below does NOT travel in the blood and act on a receptor
to cause its effects?
A. cholecystokinin
B. chymotrypsin
C. gastrin
D. secretin

If the vagus nerves (parasympathetic) were cut, which one of the following is true?
A. bicarbonate secretion by the pancreas will be inhibited in the intestinal phase
B. the cephalic phase of gastric secretions would be inhibited
C. saliva secretion would no longer occur
D. glucose absorption will be prevented

If brush border cells were no longer functioning, which one of the following could still
be digested?
A. dipeptide à amino acid + amino acid
B. triglyceride à monoglyceride + 2 fatty acids
C. fructose à glucose + sucrose
D. lactose à glucose + galactose

What is true regarding the absorption of carbohydrates?
A. monosaccharides must be further digested before they can be absorbed
B. disaccharides are absorbed with hydrogen ions across the apical membrane of
intestine cells
C. sodium cotransporters move all absorbable carbohydrates into epithelial cells
D. fructose can be absorbed with a facilitated transporter

What is true regarding carbohydrate use in the body?
A. neurons increase glycogenesis in the fed state
B. glycogenolysis in skeletal muscle provides glucose for the body
C. excess glucose is utilized in a process of lipogenesis
D. an increase in blood glucose levels results in ketogenesis

What is true about neurons that produce vasopressin (antidiuretic hormone)?
A. are found within the suprachiasmatic nucleus
B. have axons that end within the posterior pituitary
C. are activated when blood volume is elevated
D. are sensitive to blood temperature changes
20. What are mutations of the MC4 receptor

Answer 1

1. b) Chymotrypsin

Explanation: All others are the hormones that are secreted in the blood to act on the target cell. Chymotrypsin is the enzyme secreted by the intestinal glands directly into the intestine.

2. B. the cephalic phase of gastric secretions would be inhibited

Answer: The cephalic phase of gastric secretion is mediated entirely through the vagus nerve.

Cranial nerve 9 have parasympathetic fibers that causes salivary secretion.

secretin hormone produced by the intestine is responsible for stimulating the production of bicarbonate from the ductal cells of the pancreas.

3. B. triglyceride -- monoglyceride + 2 fatty acids

Explanation: Triglyceride is digested by the pancreatic enzyme lipase into fatty acids and monoglyceride.

hence It will be digested if damage to brush border cells of intestine occurs that result in deficiency of the intestinal enzyme digesting dipeptides and diasacharides

4. C. sodium cotransporters move all absorbable carbohydrates into epithelial cells

Explanation: All the glucose and absorbable carbohydrates are transported via sodium cotransporter.