Absorption is the process by which nutrient molecules pass into your blood.

Absorption is the process by which nutrient molecules pass into your blood.

• A. The breakdown of food into smaller molecules
• B. The process by which nutrient molecules pass into your blood
• C. The elimination of waste from the body
• D. The storage of nutrients in the liver

Answer: (B)

Absorption is the uptake of nutrient molecules into the bloodstream. After digestion, nutrients move from the gut lumen into the lining of the small intestine, where the extensive surface area created by villi and microvilli allows many molecules to pass into the blood through intestinal cells and capillaries. From there, these nutrients are carried via the bloodstream to organs such as the liver for processing and distribution. This definition fits the idea that absorption is about nutrients entering the blood. The other processes describe different steps: digestion is the breakdown of food into smaller molecules; elimination is waste removal from the body; storage in the liver refers to holding nutrients for later use, not their entry into the blood.

Absorption is the uptake of nutrient molecules into the bloodstream. After digestion, nutrients move from the gut lumen into the lining of the small intestine, where the extensive surface area created by villi and microvilli allows many molecules to pass into the blood through intestinal cells and capillaries. From there, these nutrients are carried via the bloodstream to organs such as the liver for processing and distribution.

This definition fits the idea that absorption is about nutrients entering the blood. The other processes describe different steps: digestion is the breakdown of food into smaller molecules; elimination is waste removal from the body; storage in the liver refers to holding nutrients for later use, not their entry into the blood.