BIOM 2000 Chapter Notes - Chapter 5: Thyroid, Ovarian Follicle, Posterior Pituitary

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The endocrine system and hormone function- an overview. The endocrine system is a major controlling system of the body. Through hormones, it stimulates such long-term processes as growth and development, metabolism, reproduction and body defense. Endocrine organs are small and widely separated in the body. Some are part of mixed glands (both endocrine and exocrine in function). Nearly all hormones are amino acid based or steroids. Endocrine organs are activated to release their hormones into their blood by hormonal, humoral, or neural stimuli. Negative feedback is important in regulating hormone levels in the blood. Bloodborne hormones alter the metabolic activities of their target organs. The ability of a target organ to respond to a hormone depends on the presence of receptors in or on its cells to which the hormone binds or attaches. Steroid hormones directly influence the target cell"s dna. The pituitary gland hangs from the hypothalamus of the brain by a stalk and is enclosed by bone.

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