A certain drug decreases heart rate by producing hyperpolarization at the membrane of the pacemaker cells of the heart. This drug is binding to ________. alpha adrenergic receptors beta adrenergic receptors muscarinic receptors nicotinic receptors ryanodine receptor
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The drug decreases heart rate by producing hyperpolarization at the membrane of the pacemaker cells of the heart. Show more…
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1) Acetylcholine, released by parasympathetic postganglionic neurons in the heart, would: Select one: Decrease the heart rate. Prevent the passage of nerve impulses through the myocardium. Stimulate increased sodium entry into sinoatrial cells. Have an effect opposite to that of histamine. Initiate ventricular diastole.
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Acetylcholine can induce the opening of K+ channels in the plasma membrane of heart pacemaker cells by: activating a nicotinic Acetylcholine receptor (an ion channel); activating PI3K; activating a muscarinic Acetylcholine receptor (a GPCR); activating PLC proteins.
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