Philosophy 1200 Study Guide - Midterm Guide: Blood Plasma, Thyroid, Trachea
23 Jan 2018
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Initial stimulus (you"re hungry) response (body secretes insulin) decreased stimulus (triggers you to stop eating) Simple diffusion: passive (think of a water dame) Fat soluble diffusion is easier then water soluble simple diffusion which is more selective . Maintaining the resting membrane potential (by using sodium/potassium pump): Neurons are using the electrical signals (action potentials) to communicate with one another. Is when the cell can"t fire another action potential because the cell is repolarizing. Note* myelin is used to help speed up the action potential. Protein/peptide hormones: protein hormones are made up of subunits called amino acids (hydrophilic) Steroid hormones: composed of cholesterol and don"t like water (hydrophobic, when a hormone ends in one, ol, en then it"s a steroid hormone. Amine hormones: made up of epinephrine which is hydrophilic. And the thyroid hormones (t3 and t4) which is hydrophobic. Hydrophilic hormones can dissolve in blood plasma and travel freely.
