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.
Endocrine glands usually release their secretions directly into the blood, which transports the secretions throughout the body. Exocrine glands however, release their secretions outside the blood. They release their secretions through tubelike structures either out of the body or directly into the digestive system.