Final answer:
The structure of the small intestine is designed to maximize nutrient absorption through various adaptations such as villi and microvilli, which greatly increase the surface area for absorption.
Step-by-step explanation:
The structure of the small intestine is designed to maximize nutrient absorption through various adaptations. The small intestine is a long tube-like organ with finger-like projections called villi, which increase the surface area for absorption. Each villus is lined with microvilli, which further increase the surface area. This significantly enhances the efficiency of nutrient absorption. Additionally, the small intestine has a large inner surface area due to the millions of microscopic villi covering its inner lining. This allows for the absorption of a greater amount of nutrients from the digested food into the bloodstream.