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The heart is said to be automatic. This means that it generates its own action potential...

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Medical Sciences

The heart is said to be automatic. This means that it generatesits own action potential and contracts without the need forinnervation. The basis for this is that some of its cells show whatis called a spontaneous depolarization that moves the membranepotential to threshold. Please give a reasonable explanation interms of changes of membrane permeability to ions that couldexplain this spontaneous depolarization termed the pacemakerpotential.

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SA node is the reason for the automaticity of the heart the action potential generated by the SA node is the SA node action potential it is a slow response action potential because the current generated in small SA node action potential have 3    See Answer
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