Multiple choice

Endocrine glands:

  1. Secrete hormones directly into the bloodstream

  2. Secrete enzymes directly into the bloodstream

  3. Secrete hormones directly into the lumen of the gut

  4. Secrete enzymes directly into the lumen of the gut
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A Correct answer
Explanation

Endocrine glands are ductless glands that secrete chemical messengers called hormones directly into the bloodstream to act on distant target organs. Exocrine glands, by contrast, secrete substances into ducts or body cavities.

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