Explain how nutrients are absorbed in the human body.

Nutrient absorption in the human body primarily takes place in the small intestine, where digested food is transferred into the bloodstream and lymphatic system.

The inner lining of the small intestine contains numerous finger-like projections called villi, which further have microvilli. These structures greatly increase the surface area for absorption.

Simple nutrients such as glucose, amino acids, vitamins, and minerals are absorbed into the blood capillaries present in the villi. From there, they are transported to different parts of the body through the bloodstream.

Fatty acids and glycerol are absorbed into the lymphatic vessels (lacteals) and later enter the bloodstream.

The absorbed nutrients are then utilized by body cells for energy, growth, repair, and maintenance.

Thus, the structure of the small intestine is specially adapted to ensure efficient absorption of nutrients.