Which is not true regarding the mammalian cardiac cycle Group of answer choices

both atria contract at roughly the same time, and then the ventricles

relaxation, or filling, phase is called diastole

the semilunar valve is the usual pacemaker

contraction, or pumping, phase is called systole

The semilunar valve is usual peacemaker

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

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