MCQOPTIONS
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| 1. |
A recording of the electrical activity of a patient's heart, shows that the atria are contracting regularly and normally, but every few beats the ventricles fail to contract. Which of the following is probably not functioning properly? |
| A. | AV node |
| B. | Semilunar valve |
| C. | Coronary artery |
| D. | Pacemaker |
| Answer» B. Semilunar valve | |