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Question

The ion that always keeps the cardiac muscle unit in contracting state is

A
Sodium
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B
Potassium
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C
Calcium
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D
Magnesium
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Solution

The correct option is C Calcium
The calcium ions are responsible for muscle contraction by generating the action potential in the muscle cells. More influx of calcium ions may contract the heart muscle to a prolonged state of contraction, which will lead to abnormal increase in the heart rate.

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