Many adults living in the US become curious about doctor prescribed growth hormone replacement therapy when they begin to experience chronic symptoms, such as low energy, fatigue and low sex drive, that are frequently associated with your bodyâs declining growth hormone levels.
External, or exocrine, secretion is distinguished from internal, or endocrine, secretion. In external secretion the products elaborated by a gland are released into the external environment; the secretion first enters the glandular duct, from which it is discharged onto the surface of the body or into hollow organs.
There are two types of glands in the endocrine system, exocrine glands that take their secretions to the surface through ducts that exit the body (e.g., mammary, sebaceous, sweat, and glands that secrete digestive enzymes), and endocrine glands, the seven sets of gland secrete different hormones directly into the blood (they do not have ducts that carry their secretions to the surface and out of the body); the endocrine hormones are