Question

Describe one way in which the small intestine is adapted for the absorption of digested food.

Answer 1

The main adaptation is a massively increased internal surface area due to millions of tiny, finger-like projections called villi.

This structure helps in three ways:

• More Space: Villi (and even tinier microvilli) fold the inner lining, providing a huge amount of surface area to absorb nutrients.
• Thin Walls: The outer layer of the villi is only one cell thick, allowing digested food to pass through extremely fast.
• Rich Blood Supply: Each villus is packed with blood vessels that immediately carry the absorbed nutrients away to the rest of the body.