9.3 Absorption

Question 1

Where does the absorption start at ? Absorbed by who ?

Answer 1

ileum of the small intestine . Absorbed by villi.

Question 2

Adaptation of ileum for absorption :
1.L__

Answer 2

Long and folded to provide a large surface area for abrsoption of digested food .

Question 3

Adaptation of ileum for absorption :
2. N____

Answer 3

Numerous villi to absorb nutrients .

Question 4

What are villi ?

Answer 4

Villi are tiny projections in the wall of ileum .

Question 5

What does villi consists of ?

Answer 5

Consists of lacteal , a network of blood capillaries and a thin epithelium .

Question 6

On the surface of villus , there are many tiny projections called ?

Answer 6

Microvillus .

Question 7

Function of microvillus :

Answer 7

Provide a large surface area to increase the rate of nutrient absorption .

Question 8

Adaptations of villus for absorption :
1. One

Answer 8

The epithelial layer of villus is one cell thick to increase the rate of nutrient absorption .

Question 9

Adaptations of villus for absorption :
2.Network / transport

Answer 9

Has a network of blood capillaries to transport digestive products to the whole body and allow rapid absorption.

Question 10

Adaptations of villus for absorption :
3. lacteal

Answer 10

Has many lacteal to absorb and transport fatty acids , glycerol , vitamin ADEK .

Question 11

Adaptations of villus for absorption :
4. microvilli

Answer 11

Has many microvilli to increase the surface area for nutrient absorption .

Question 12

Adaptations of villus for absorption :
5. move back and forth

Answer 12

Villi can move forward and backward to come into contact with digested food and facilitate diffusion .

Question 13

Function of goblet cell in the ileum :

Answer 13

Produces mucus which protects the epithelial cell from being digested by enzymes