what would cause a increase in cardiac muscle cell contractility? an decrease in sympathetic nervous activity a decrease in extracellular calcium ion concentration an increase in na ion concentration a increase in cytosolic calcium ion concentration an increase in parasympathetic nervous activity

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21-11-2022
Biology

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what would cause a increase in cardiac muscle cell contractility? an decrease in sympathetic nervous activity a decrease in extracellular calcium ion concentration an increase in na ion concentration a increase in cytosolic calcium ion concentration an increase in parasympathetic nervous activity

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ArunVenu252 ArunVenu252 · Answer 1 · 2022-11-23T19:36:42+01:00

Boosting calcium inflow or sustaining greater calcium levels in the cytosol of cardiac myocytes during an action potential are the major methods for increasing contractility.

What factors affect heart contractility?

The length and intensity of the active state (the interval between contraction and relaxation) affect contractility as evaluated by the force of cardiac muscle strips contracting in vitro (rate of contraction).

The atrial syncytium and the ventricular syncytium are the two functional syncytia in which cardiac muscle fibres are electrically connected. The endogenous heart rate is set to around 100 beats per minute by the cardiac muscle SA node, which is spontaneously active.

The hormone acetylcholine is released by the parasympathetic nervous system (PNS) to reduce the heart rate.

Learn more about cardiac myocytes refer

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