26. During ventricular systole, the semilunar valves ________ and the AV valves ________.(A) open； o
問題詳情
26. During ventricular systole, the semilunar valves ________ and the AV valves ________. (A) open； open (B) close； open (C) open； close (D) close； close (E) open, unchanged.