Question

1)

Select the CORRECT match:

	A.	Peristalsis - increases with sympathetic nervous system stimulation
	B.	Internal anal sphincter - under voluntary control
	C.	Lacteals - lymph capillaries, transport chylomicrons
	D.	Pancreas - synthesizes bicarbonate in response to CCK (cholecystokinin)
	E.	Micelles - lipids coated with bile salts formed in stomach lumen

2)

The gastrocolic reflex normally:

I. is initiated by swallowing

II. inhibits gastric secretions and motility

III. inhibits the defecation reflex

IV. initiates mass movement in the large intestine

	A.	I, II, III, and IV
	B.	I, II, and III only
	C.	IV only
	D.	II and IV only
	E.	I and III only

3)

When a strong acid such as HCl is added to the carbonic acid buffer system, ________________.

	A.	None of the answers listed are correct
	B.	the blood plasma pH is reduced
	C.	carbonic acid is converted into bicarbonate
	D.	hydrochloric acid is neutralized by sodium hydroxide
	E.	more carbonic acid is formed

Answer 1

1 C lactea-lymph capillaries, transport chylomicron

a..Peristalsis - increases with parasympathetic nervous system stimulation

.

b- under involuntary control

C bicarbonate secreation depend on secratin

3 c carbonic acid converted to bicarbonate

Maintaining a constant blood pH is critical for the proper functioning of our body. The buffer that maintains the pH of human blood involves a carbonic acid

When any acidic substance enters the bloodstream, the bicarbonate ions neutralize the hydronium ions forming carbonic acid and water. Carbonic acid is already a component of the buffering system of blood. Thus hydronium ions are removed, preventing the pH of blood from becoming acidic.

2 c

The gastrocolic reflex increases movement in the gastrointestinal tract, and reacts to stretches in the stomach walls as well as in the colon. It is responsible for the urge to defecate, the movement of digested material in the small intestine, and it makes room for more food within the stomach.

It is intimated by swallowing so. I is correct

It inhibit gastric secretion and motility II -it is not clearly correct because enterogastric reflex A nervous reflex whereby stretching of the wall of the duodenum results in inhibition of gastric motility and reduced rate of emptying of the stomach. It is a feedback mechanism to regulate the rate at which partially digested food (chyme) leaves the stomach and enters the small intestine.

Inhibit defeaction reflex-III wrong gastrocolic reflex acts as a stimulus for defecation