Heart beats are affected by

Carbon dioxide

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Oxygen

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Vagus nerve

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All of the above

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Solution

The correct option is D All of the above
Heart beats depend upon oxygen and carbon dioxide concentrations in the blood. When the oxygen amount reduces or the carbon dioxide amount increases in the blood, the heart has to pump more number of times to oxygenate the blood faster. Vagus nerve stimulation deceases the heart rate.

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