BIOL BC 1500x Lecture 13: 13: Endocrine System

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Target organs: interpret hormones via cells that bind with them. Receives input from sensors within itself and all over body. Posterior pituitary:neurosecretary cells in hypothalamus secrete adh and oxytocin, released from posterior pituitary. Oxytocin: pregnant women go into labor and produce milk. Hypothalamus secretes releasing or inhibitory hormones, anterior pituitary releases or stops releasing appropriate hormones. Some hormones target other endocrine glands, some target organs. Other endocrine glands: fsh and lh (testes and ovaries), acth (adrenal cortex), tsh (thyroid) Organs/tissues: prolactin (mammary glands), growth hormone (muscles, bones, tissues), Negative feedback: change occurs in physiology, triggers reaction to undo the change. Hypothalamus sends thyroid-releasing hormone, pituitary releases thyroid-stimulating hormone, thyroid releases hormones that stimulate aerobic metabolism, thyroid hormone inhibits pituitary secretion of tsh (turns system on) Endocrine glands not under control of hypothalamus (self-regulating) Monitor aspect of physiology, turn on and shut off as needed. Hormones produced in stomach go through capillaries and return to stomach.

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