Read the following statements regarding the nodal tissue of the human heart. (A) The nodal musculature is autoexcitable and requires external stimuli to generate an action potential. (B) The Sino-atrial node (SAN) generates the maximum number of action potentials, i.e., 70-75 min ⁻¹ . (C) The SAN is present in the right upper corner of the right atrium. (D) The Atrio-ventricular node (AVN) is situated in the lower le

Step-by-step solution

Statement (A) is incorrect because autoexcitable means the nodal musculature has the ability to generate action potentials without any external stimuli, not that it requires them. Statement (B) is correct as the SAN generates the maximum number of action potentials ( 70-75 min ⁻¹ ) and acts as the pacemaker. Statement (C) is correct as the SAN is anatomically located in the right upper corner of the right atrium. Statement (D) is correct as the AVN is located in the lower left corner of the right atrium, close to t