問題詳情
47. The main function of the atrioventricular (A-V) node is to
(A) initiate the heartbeat.
(B) set the rhythm of the heartbeat.
(C) relay the signal for the heart to contract from the left ventricle to the left atrium.
(D) relay a signal for the ventricles to contract.
(E) detect the vibration of heart.
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增