1.1.6 Cardiac cycle Flashcards

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1
Q

Describe atrial systole

A

Blood flows into the atria, and is then put under pressure so to push through the AV valves into the ventricles

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2
Q

Describe ventricular systole

A

The ventricles contract from the base up, increasing pressure so to push the AV valves closed and the SL valves open, so the blood can flow into the arteries

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3
Q

Describe diastole

A

The atria and ventricles both relax. The SL valves are closed by backflow of blood. Low pressure in the atria helps draw in blood from the veins

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4
Q

What is the cause of the heart’s beating sound?

A

The sound is caused by the closing of the AV and SL valves

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