A) ductless glands whose secretions pour directly into blood
B) have ducts and pour their secretions into blood directly
C) have ducts which straightway pour secretions into target organs
D) all of the above
Correct Answer: A
Solution :
Endocrine glands (ductless glands) or glands of internal secretion have no ducts and their secretion get absorbed into the immediate surrounding blood circulation to reach the specific organ to initiate a particular metabolic change.
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