The cardiac cycle

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8 Terms

1
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What is the normal resting heart beat

70 bpm

2
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What are the two phases called

Contraction - systole

Relaxation - diastole

3
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What all the 3 different stages called

Atrial systole

Ventricular systole

Diastole

4
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How does blood moved through the heart

Through the 3 different stages

Atrial systole

Ventricular systole

Diastole

5
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What happens when the atrial systole occurs

The pressure in the atrium slowly rises as blood flows into the atrium from the veins

Walls of the atrium contract

Pressure in the atrium is higher than the ventricle

The bicuspid and tricuspid valves are forced to open

Blood flows into the ventricle

6
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What happens when the ventricular systole occurs

The ventricle wall contracts

The ventricle pressure increases until it's higher than that of the aorta

The semi-lunar values open

The flow of blood closes the bicuspid and tricuspid values

Blood is forced into aorta causing he pressure in the aorta to increase

A “ lub “ sound is heard

7
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What happen when the diastole stage occurs

The ventricle and the atrium relax

The pressure in the ventricle is lower than the aorta

The pressure in the aorta is kept higher by elastic recoil of the elastic tissue in the middle layer

The semi - lunar values are forced to closd

A “ dub “ sound is heard

8
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