Which of the following statements is true?
a. during ventricular systole, the papillary muscles contract to keep the AV valves shut and prevent them showing up into the atria
b. if you increase ESV, then you will increase SV
c. If you increase heart rate, then you will increase SV
d. none of the listed statements is true
Answer: a. during ventricular systole, the papillary muscles contract to keep the AV valves shut and prevent them showing up into the atria
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