HUMAN PHYSIOLOGY
DIGESTION AND ABSORPTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
I only
|
|
|
I and II
|
|
|
I, II and III
|
|
|
I and III
|
Detailed explanation-1: -Microvilli increase the surface area of the small intestine which helps in absorption.
Detailed explanation-2: -Villi are specialized for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path. They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream.
Detailed explanation-3: -Villi and microvilli increase the surface area of the small intestine, which increases the absorption of nutrients by diffusion. Villi and microvilli form the inner layer of epithelial tissue in the small intestine and increase the absorption of nutrients from chyme.
Detailed explanation-4: -The mucosa of the small intestine is enlarged ∼1.6 times by the plicae circulares. Morphometric data obtained by light and electron microscopy of biopsies demonstrate that villi and microvilli together amplify the small intestinal surface area by 60-120 times.