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 ...

Exocrine tissues are classified by type of secretion, for example serous, mucous or mixed, and mechanism of release of secretory product e.g. merocrine, apocrine, holocrine. The salivary glands are ...

The integumentary system is the physical system that forms the barrier between the external environment and the internal systems of the body. In humans, this system consists of skin, hair, nails, and ...