95. The brush Border of the small intestine epithelial cells is responsible for

Question

95. The brush Border of the small intestine epithelial cells is responsible for digestion and absorption of food substances by which of the following mechanism?

a.by exerting a stroking action that sweeps the end products of digestion to the absorptive surfaces

b.by supplying digestive enzyme and specific carriers for membrane transport

c. by propelling chyme down the digestive tract

d. by breaking food particles into smaller sizes by brushing action

97. Hormones acting in the small intestine include

a.secretin and cholecystokinin

b.secretin and gastrin

c. cholecystokinin and gastrin

d. all of the above

e. none of the above

Explanation / Answer

95. a. by exerting a stroking action that sweeps the end products of digestion to the absorptive surfaces

The micelles move into the brush border of the small intestine absorptive cells where the long-chain fatty acids and monoglycerides diffuse out of the micelles into the absorptive cells, leaving the micelles behind in the chyme. Large, complex molecules of proteins, polysaccharides, and lipids must be reduced to simpler particles before they can be absorbed by the digestive epithelial cells.

97. a. secretin and cholecystokinin

Chyme in the duodenum triggers the release of 2 major enterogastrones

            Cholecystokinin (CCK) - release triggered primarily by fat and protein in chyme

            Secretin- release triggered primarily by acidic chyme

Gastrin- secreted from special endocrine cells in the pyloric gland area (stomach!) into the blood

Related Questions

Navigate

• Browse (All)
• Browse 9
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.