Question

What are the 4 main characteristics of classic endocrine glands?

a) Ductless, vascular, secrete hormones, exocrine function
b) Ductless, avascular, secrete enzymes, endocrine function
c) Ducted, avascular, secrete hormones, endocrine function
d) Ducted, vascular, secrete enzymes, exocrine function

Answer 1

The correct answer is that classic endocrine glands are ductless, vascular, secrete hormones, and have an endocrine function. They release hormones directly into the bloodstream, unlike exocrine glands that use ducts.

Step-by-step explanation:

The four main characteristics of classic endocrine glands are: a) ductless, b) vascular, c) secrete hormones and d) endocrine function. So, the correct answer to the question is that classic endocrine glands are ductless, highly vascular, secrete hormones, and have an endocrine function (option a), meaning they release their hormones directly into the bloodstream. This is in contrast to exocrine glands that release their substances through ducts to an external or internal surface.