Page 134 - Primary Five Science

Adaptation of the ileum to absorption of digested food.

1. The ileum is fairly long to increase surface area for absorp-

tion.

2. I has villi, which also help to increase the rate of food ab-

sorption of digested food.

3. I has thin walls to allow easy diffusion of food.

4. I has a dense network of capillaries that carry away ab-

sorbed food.

5. I has secretory glands which secretes enzymes to complete

food digestion.

The hepatic portal vein takes blood rich in digested food from

the small intestine to the liver for processing.

The hepatic portal vein takes blood rich in digested food from

the ileum to the liver.