Multiple choice

Which of the following flows directly into blood?

  1. Enzyme

  2. Hormone

  3. Minerals

  4. Proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hormones are secreted by glands with the help of ducts at specific sites or directly pour their secretions in into the blood. Enzymes are only secreted at their site of action.

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