Q What is the name of the part of the body that serves as the heart's natural pacemaker?
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Explanation
The correct answer is option C, the Sinus Node, which is also known as the natural pacemaker of the heart. The sinus node is a cluster of myocytes that act as pacemakers, initiating the heart's contractions. The sinus node can generate approximately 70 to 75 action potentials each minute, which trigger the heart muscles to contract.
The Purkinje fibers, option A, are a network of specialized cardiac muscle fibers that relay electrical impulses from the AV node to the ventricles. The AV node, option B, is a region of the heart that slows down the electrical signal coming from the atria before passing it on to the ventricles. The Bundle of His, option D, is a collection of fibers that transmits the electrical impulses from the AV node to the ventricles.
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