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Stack #4552399
| Question | Answer |
|---|---|
| By which two processes does absorption occur? | By diffusion and active transport. |
| What is the ileum? | The last part of the small intestine adapted for efficient food absorption. |
| Why is the ileum very long? | It is about 5 m long in an adult, providing a large surface area for rapid absorption. |
| What are villi? | Finger-like projections on the inner surface of the ileum that greatly increase the surface area for absorption. |
| What is inside each villus? | A network of blood capillaries and a lacteal. |
| What is the function of the capillaries and lacteal in each villus? | They transport the products of digestion rapidly away from the ileum. |
| What is the epithelium of a villus? | The thin wall of each villus that is only one cell thick. |
| Why is the epithelium of the villus thin? | So digested food can pass rapidly through into the capillaries and lacteal. |
| What are microvilli? | Tiny projections on the epithelial cells that further increase the surface area for absorption. |
| How is the ileum adapted for absorption? | It is long, has many villi and microvilli, a thin epithelium, and a rich supply of blood capillaries and lacteals for efficient absorption. |
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