MCB 180 Lecture Notes - Lecture 1: Pituitary Gland, Chemical Substance, Homeostasis
5 Aug 2016
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Document Summary
Endocrine glands: secrete hormones into adjacent tissue spaces from which they are picked up by the blood stream and are carried to other parts of the body where they exert their effects. Gland: an organ that secretes particular chemical substances for use in the body or for discharge into the surroundings. Gonadotropins: fsh/lh stimulate the gonads (men- testosterone)(women-progesterone/estrogen) Horman to set in motion or to excite. Hormone: chemical substance that controls/regulates the activity of certain cells or organs. Paracrines chemical messengers that are produced by endocrine cells and diffuse to act locally on adjacent target cells with the appropriate recpetors. 2 types of general hormones: protein linear sequence of amino acids. Protein hormones are hydrophilic (water loving: steroid derived from cholesterol. Is a protein on the surface of a cell that binds to a specific protein hormone. Cell membrane consists of lipid bilayer with proteins (receptors, ion channels, and other channels) embedded in it.
