Multiple choice

All endocrine glands pour their secretions into:

  1. arterial blood

  2. venous blood

  3. both (1) and (2)

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

Endocrine glands lack ducts and release hormones directly into capillaries - which are venous microvessels. From there, hormones enter general circulation via veins. Arterial blood carries hormones away from heart to tissues, but glands don't secrete into arteries directly.

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