Question

Give reason why endocrine glands are highly vascular

Answer 1

Endocrine glands ae ductless glands. This means that unlike exocrine glands which pour their hormones in ducts that transport them to the target cells, endocrine cells do not have any ducts. So they pour their secretions that is hormones directly into the blood and the blood transports them to the target cells.
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Answer 2

Endocrine Glands do not have duct that's why we also call it ductless glands. Endocrine glands pour their secretion (hormones) direct into blood and through blood hormones reach to their targets. This is the main reason why endocrine glands are highly vascular. Because highly vascular provides more blood vessels which contains more blood. So, after pouring hormones into blood vessels by endocrine glands probably to reach to target becomes high.