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Editor · #1

14 With regards to the Cardiac Cycle
a) at a higher HR the PR interval is constant
b) the higher HR the lower diastolic time
c) the absolute refractory period is the same length as the Q-T interval
d the aortic valve opens just before isometric contraction

#2

mark wrote:
[quote]14 With regards to the Cardiac Cycle
a) at a higher HR the PR interval is constant
b) the higher HR the lower diastolic time
c) the absolute refractory period is the same length as the Q-T interval
d the aortic valve opens just before isometric contraction[a,b/quote]

At higher HR the PR interval is constant, this is correct, th QT differs and the diastolic time is lower, this is also correct. c I don\'t remember. the aortic valve opens after the isovolumetric contraction.