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The Sino-Atrial Node, often referred to as the pacemaker of the heart, is a specialized bundle of neurons located in the right atrium. It is responsible for initiating the electrical impulses that lead to cardiac contraction.
In a healthy adult human, the heart rate is typically defined by the frequency of impulses generated by the SAN. This rate is standardly recognized in human physiology as approximately 70 to 75 beats per minute.
Comparing the standard physiological range (70-75) with the provided options, option (C) aligns perfectly with the textbook definition of the normal resting heart rate.
Final Answer: 70-75