Cardiac Cycle Flashcards
How many times does a human heart beat every minute? (On average)
72 times
How long does a heartbeat last?
0,8 seconds
What is a cardiac cycle?
All of the changes that occur in one heartbeat
What is systole?
The contraction of any part of the cardiac muscle
What is diastole?
The relaxation of any part of the cardiac muscle
What are the three phases of the cardiac cycle?
Atrial systole
Ventricular systole
General diastole
What instrument measures the cardiac cycle of a person?
An ECG machine
How long does atrial systole last?
0,1 seconds
What must you describe when describing a stage of the cardiac cycle?
The chamber that contracts or relaxes
The direction of the blood flow
The valve activity
What happens during atrial systole?
Both atria are filled with blood and contract simultaneously
The openings of the vena cavae and the pulmonary veins are squeezed shut because of this contraction
The cuspid valves are forced open
Blood is pumped to the ventricles
How long does ventricular systole last?
0,3 seconds
What indicates that ventricular systole is happening?
There will be a “lub” sound
Why does a “lub” sound occur during ventricular systole?
The sound is created from the cuspid valves closing
What happens during ventricular systole?
The ventricles contract simultaneously
The cuspid valves close
The semilunar valves open
Deoxygenated blood is pumped from the right ventricle into the pulmonary vein
Oxygenated blood is pumped from the left ventricle into the aorta
How long does General diastole last?
0,4 seconds
