Endocrine glands secrete hormones into the bloodstream, while exocrine glands secrete substances, such as sweat or enzymes, into organs or onto the surface of the body. The two main types of glands in ...

The changes in the cytoplasmic components of the, cells of the alimentary tract during fasting and after feeding have been described for several animals of widely separated groups, but, so far as I am ...

Medically reviewed by Brendan Camp, MD Key Takeaways The skin is the body's largest organ and helps protect internal organs ...