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The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The...

The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The resting membrane potential of typical neurons is approximately -60 to -70 mV. Why is the resting potential of cardiac muscle cells lower than that of a typical neuron?

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The resting potential of cardiac muscle cells is lower than that of a typical neuron because the neurons are excitable cells and they help in transferring the signals from one cell to another. When the neuron is at its resting membrane potential, the area outside the neuron has more Na+ ions and the inside have more K+ ions. Due to this, it tends to have net negative charge inside the cell and hence due to this it triggers the action potential. As the inside of the neuronal cells is much lower than that of the cardiac muscle cell, it tends to have a higher resting membrane potential.

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