Practice question · Multiple choice
Why are endocrine glands richly supplied with blood vessels while the epithelium they developed from is not?
Hints
- Ask where the secretion has to go in each case.
- An endocrine gland has no duct, so the blood IS its delivery route.
Show the answer
C. They secrete hormones directly into the bloodstream rather than onto a surface
Why
An endocrine gland loses its duct, so the bloodstream becomes its delivery route and it must be richly vascularised. An exocrine gland keeps its duct and delivers onto a surface, so it does not need that supply.
Practise Epithelial Tissue and Glands
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More questions on Epithelial Tissue and Glands
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