What process involves nutrients moving from the intestine into the blood?

What process involves nutrients moving from the intestine into the blood?

• A. Absorption
• B. Digestion
• C. Metabolism
• D. Secretion

Answer: (A)

The main idea is absorption: it’s the uptake of digested nutrients from the intestinal lumen across the intestinal lining into the bloodstream (and lymphatic system) so they can be circulated to tissues. Digestion is the breakdown of large molecules in the gut, which happens first, but it’s absorption that moves those smaller, usable nutrients into the body’s circulation. Metabolism refers to how cells use those nutrients for energy and building blocks, while secretion is the release of substances like enzymes or mucus. Note that most nutrients move into blood during absorption, though fats can briefly enter the lymph before reaching the blood.

The main idea is absorption: it’s the uptake of digested nutrients from the intestinal lumen across the intestinal lining into the bloodstream (and lymphatic system) so they can be circulated to tissues. Digestion is the breakdown of large molecules in the gut, which happens first, but it’s absorption that moves those smaller, usable nutrients into the body’s circulation. Metabolism refers to how cells use those nutrients for energy and building blocks, while secretion is the release of substances like enzymes or mucus. Note that most nutrients move into blood during absorption, though fats can briefly enter the lymph before reaching the blood.