Secretions That are Discharged Directly into the Blood are Characteristic

Question

Secretions that are discharged directly into the blood are characteristic of ________ glands.
A)exocrine
B)merocrine
C)endocrine
D)apocrine
E)holocrine

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, which then travel to target organs or tissues. Exocrine glands secrete substances through ducts that lead to body cavities or external surfaces. Merocrine, apocrine, and holocrine glands are types of exocrine glands that differ in the way they release their secretions.