Item BF038004: Amino acids enter the circulatory system from the digestive system by passing through the walls of microscopically small blood vessels (capillaries), but proteins do not.

Which of the following statements is TRUE about the movement of proteins and amino acids from the digestive system to the circulatory system?

  1. Both proteins and amino acids enter the circulatory system by passing through the walls of microscopically small blood vessels (capillaries).
  2. Proteins enter the circulatory system by passing through the walls of microscopically small blood vessels (capillaries), but amino acids do not.
  3. Amino acids enter the circulatory system by passing through the walls of microscopically small blood vessels (capillaries), but proteins do not.
  4. Neither amino acids nor proteins enter the circulatory system from the digestive tract.

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