BI-610
The digestive system
Biology · Secondary 3 · Medium · The digestive system
A villus in the small intestine has many capillaries close to its surface. How does this adaptation help absorption?
- It maintains a steep concentration gradient for nutrients to diffuse into the blood.
- It increases the production of digestive enzymes.
- It stores undigested food temporarily.
- It reduces the surface area of the villus.
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