Automaticity is the myocardial cell's ability to do what? Self-regulate membrane potential Initiate systole and diastole Generate an electrical impulse if one is not received Replenish electrical imbalances resulting from depolarization
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Step 1: Myocardial cells have the ability to generate an electrical impulse if one is not received from the pacemaker cells in the heart's conduction system. Show more…
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The pacemaker action potentials in the heart a. are due to opposing actions of norepinephrine and acetylcholine. b. are generated by the bundle of His. c. depend on the gap junctions between the cells that make up the atria and those that make up the ventricles. d. are due to spontaneous depolarization of the plasma membranes of modified cardiac muscle cells. e. reflect large depolarizations of membrane potential due to opening of voltage-gated $\mathrm{Na}^{+}$ channels.
The correct sequence for depolarization and repolarization is (A) Stimulus applied at a site on polarized membrane (B) Increase the permeability for $\mathrm{Na}^{+}$ (C) Generation of A.P.(Action Potential) (D) Increase the permeability for $\mathrm{K}^{+}$ (E) Restoration of membrane potential (a) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$ (b) $\mathrm{B} \rightarrow \mathrm{A} \rightarrow \mathrm{C} \rightarrow \mathrm{D} \rightarrow \mathrm{E}$ (c) $\mathrm{A} \rightarrow \mathrm{D} \rightarrow \mathrm{C} \rightarrow \mathrm{B} \rightarrow \mathrm{E}$ (d) $\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{D} \rightarrow \mathrm{C} \rightarrow \mathrm{E}$
The rapid repolarization of the membrane in an action potential is caused by none of the above opening of voltage-gated K+ channels in response to peak depolarization closing of the slow inactivation gates on Na+ channels opening of voltage-gated K+ channels in response to the initial threshold depolarization opening of voltage gated Ca2+ channels in the axon terminal
Rupsa S.
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