Lesson 13 of 17
Villi give food a way in
Show on a big screenDigested food must pass into the blood. A flat wall would have too little room.
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The idea
Step 1 of 4
- A flat lining has a short surface.
- The small intestine has many finger-like villi.
- The same space now has a much longer surface.
- Digested food passes into the blood through them.
Finger-like villi line the small intestine. They give a big surface for absorbing digested food.
More surface means more room for food to pass into the blood. Villi cover the inner wall of the small intestine.
Taking digested food into the blood is called absorbing it.
Try the lab to finish this lesson.