BIOL 1080 Study Guide - Final Guide: Osteoporosis, Microvillus, Aorta

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Major glands include the pituitary gland, thyroid gland, parathyroid gland, adrenal glands, and pineal gland. Organs with endocrine tissue include the hypothalamus, thymus, pancreas, ovaries, testes, heart, and placenta: main function is to regulate and coordinate other organ systems and maintain homeostasis. Once bound, the hormone-receptor complex exerts the effects on cells. Lipid-soluble hormones they include steroid hormones, and are derived from cholesterol. Move easily through every cell"s plasma membrane because it is a lipid bilayer. (left: water-soluble hormones protein or peptide hormones that cannot pass through lipid bilayer, so cannot enter target itself. Instead, they (first messengers) bind to receptors on the plasma membrane, causing the activation of second messengers in the cytoplasm that use enzymes to carry out the desired effects of the hormone. (right) Feedback mechanisms and secretion of hormones: negative feedback mechanism outcome of a process feeds back to the system, shutting down the process.

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