Biology · Endocrine and Exocrine Systems
What is the primary structural feature that distinguishes exocrine glands from endocrine glands?
- 1Presence of a blood-brain barrier
- 2Secretion of hormones directly into the blood
- 3Absence of a blood supply
- 4Presence of ducts to secrete substances✓
Correct answer
Presence of ducts to secrete substances
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