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Unformatted text preview: only. c. Binding of epinephrine to blood vessel adrenergic receptors may cause dilation or constriction of the blood vessel, depending on the adrenergic receptor isoform present. d. Atropine is an antagonist at muscarinic cholinergic receptors. e. All autonomic reflexes must be polysynaptic. 3. Hormones a. A very low concentration of a hormone is sufficient to produce its effect on target cells. b. Membrane potential can be altered by the action of a hormone on a cell. c. A peptide hormone is passed through and processed in the endoplasmic reticulum and Golgi apparatus before being released from secretory vesicles to the extracellular fluid. d. Proinsulin is cleaved to insulin and C-peptide. e. Because its water soluble, a peptide hormone will passively diffuse from the bloodstream into its target cells interior ....
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- Spring '07