MCQOPTIONS
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MCQOPTIONS
| 1. |
The first heart sound is produced by the_____________? |
| A. | Closure of the aortic and pulmonary valves |
| B. | Opening of the aortic and pulmonary valves |
| C. | Closure of the mitral and tricuspid valves |
| D. | Opening of the mitral and tricuspid valves |
| Answer» D. Opening of the mitral and tricuspid valves | |