Assertion (A): The sinoatrial (SA) node is located in the upper right corner of the right atrium. Reason (R): It is a specialized mass of cardiac muscle tissue.
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is NOT the correct explanation of A
- CA is true but R is false
- DA is false but R is true
✓ Correct answer: B
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