KINS 1224 Chapter Notes - Chapter 17: Hypophyseal Portal System, Anterior Pituitary, Posterior Pituitary

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Principal organs: pituitary gland, pineal gland, thyroid gland, parathyroid glands, thymus, Principle functions: hormone production; internal chemical communication and coordination. Paracrine- are secreted by one cell diffuse to nearby cells in the same tissue, and stimulate their physiology. (local hormones) Hormones- are chemical messengers that are transported by the bloodstream and stimulate physiological responses in cells of another tissue or organ. Exocrine glands- secrete their products by a duct on to epithelial surface like skin or mucosa. Endocrine glands- are ductless releasing sections into blood. Exocrine sections have extracellular effects like digestion of food. Endocrine secretions have intracellaur effects they alter cell metabolism. (sum of internal chemical change) anabolism build up. Endocrine glands have a usually high density of blood capillaries so they can excrete hormones. Large pores in their walls allow for the easy uptake of matter from the gland tissue. Some glands and secretory cells are both endocrine and exocrine.

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