BIOL 1080 Lecture Notes - Lecture 10: Anterior Pituitary, Cerebellum, Connective Tissue

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Endocrine glands: made of secretory cells that release their products called hormones. Hormones move from the cells that produced them to the fluid just outside the cells, where they diffuse into the bloodstream. Endocrine system: consists of endocrine glands and organs that contain some endocrine tissue. ** these organs have other functions besides hormone secretion. Hormones as chemical messengers: they are realeased in small amounts, they most often only effect a target cell, these target cells have receptors, protein molecules that bind to certain hormones. Lipid soluble hormones: (steroid hormones) derived from cholesterol, ovaries, testes and adrenal glands are the main organs for secreting hormones. These hormones move easily through plasma membranes because it is a lipid bilayer. Once in the target cells, the steroid hormone combines with molecules from the cytoplasm, which then moves into the nucleus of the cell where it attaches to the dna and activates certain genes. Such activation ultimately leads to synthesis of proteins.

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