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


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