Biology · Endocrine and Exocrine Systems
Which structural characteristic is defining for endocrine glands?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1They are connected directly to the external body surface.
- 2They only secrete mucus and watery fluids.
- 3They are ductless and release secretions into the bloodstream.✓
- 4They possess long branching ducts.
Correct answer
They are ductless and release secretions into the bloodstream.
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