Biology: The Cardiac Cycle Flashcards

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1
Q

What happens during atrial systole?

A

-ventricles relax, atria contract -volume decrease, pressure increase -atrioventricular valves fully open -blood pushed into ventricles

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2
Q

What happens during ventricular systole?

A

-ventricles contract, atria relax -volume decrease, pressure increase -atrioventricular valves close -semilunar valves forced open -blood pumped through arteries

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3
Q

What occurs during diastole of the cardiac cycle?

A

-atria and ventricles relax -arterial pressure lower than veins -semilunar valves close -blood enters atria from veins -atria pressure exceeds ventricular pressure -atrioventricular valves open slightly -blood into ventricles passively -cycle restarts

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4
Q

What is one heartbeat equal to?

A

time it takes for one complete cardiac cycle

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5
Q

What equation is used to calculate cardiac output?

A

cardiac output (cm3min-1) = stroke volume (cm3/beat) x heart rate (bpm)

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