Regulation of heart beat in mammals is due to–

The volume of blood in the circulatory system

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The presence of excess of oxygen in blood

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The presence of thyroxine in blood

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The presence of pacemaker in the heart

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Solution

The correct option is D The presence of pacemaker in the heart
In mammals heart-beat is regulated by a specialized muscle bundle (pacemaker).
Natural pacemaker of heart is SA node, located in right atrium. It sends an electrical impulse to make our heart beat.
So, the correct answer is - the presence of pacemaker in the heart.

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