BIOL 1080 Lecture Notes - Lecture 1: Anterior Pituitary, Posterior Pituitary, Pituitary Gland

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Our bodies contain two types of glands: exocrine glands and endocrine glands. Endocrine glands: are made of secretory cells that release their products, called hormones. Hormones: move from the cells that produced them to the uid just outside the cells, where they diffuse directly into the bloodstream. Endocrine system: consists of endocrine glands and of organs that contain some endocrine tissue; these organs have other functions besides hormone secretion. The major endocrine glands are the pituitary gland, thyroid gland, parathyroid glands, adrenal glands, and pineal gland. Hormones: are the chemical messengers of the endocrine system. They are released in very small amounts by the cells of endocrine glands and tissues and enter the bloodstream to travel throughout the body. Hormones are classi ed as being either lipid soluble or water soluble. Lipid-soluble hormones: include steroid hormones, a group of closely related hormones derived from cholesterol. Move easily through any cell"s plasma membrane because it is a lipid bilayer.

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