Question

glands that secrete their products into tissue fluid or blood are called ______ glands. endocrine sebaceous sweat exocrine

Explanation:

Endocrine glands secrete hormones directly into the bloodstream or tissue fluid. Sebaceous glands secrete sebum onto the skin surface. Sweat glands secrete sweat onto the skin surface. Exocrine glands secrete substances through ducts to an epithelial surface.

Answer:

A. endocrine