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Functions of the exocrine and endocrine systems are accomplished through collections of glands that influence processes and organs throughout the body. Endocrine glands secrete hormones while exocrine glands secrete a variety of substances, mostly enzymes, with many different purposes. Endocrine glands have no connection to the surface of the body, and their secretions enter the bloodstream. Exocrine glands have a connection to the surface. They either have ducts or do not need them because they develop close enough to the surface or inner cavities.

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1. Endocrine System

The endocrine system is made up of glands that produce hormones to influence and regulate growth, reproduction, sexual development and function, metabolism, mood, and sleep. Glands in the endocrine system include the pancreas, thyroid gland, adrenal glands, parathyroid glands, pituitary gland, and the ovaries or testicles. The various glands produce hormones. Organs have receptors for specific hormones, so the exocrine system functions by releasing hormones to instruct these organs through their receptors.

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