Cardiac Cycle Graphs

Question 1

What is in a cardiac cycle graph?

Answer 1

ECG

Pressure (mmHg)

Volume of the left ventricle

Question 2

What is the cycle of the cardiac cycle graph?

Answer 2

atrial diastole -> atrial systole -> atrial diastole -»»

ventricular diastole -> ventricular systole -> ventricular diastole

Question 3

What is the atrial systole?

Answer 3

only point where atria contract

ventricles contract after atria contract and when it is not contracting, it is in diastole phase

Question 4

What is the volume of the left ventricle?

Answer 4

the left ventricle will fill mostly when the atria contracts

when the atria contracts, the volume will go to its peak but as ventricles contract, the volume will decrease

Question 5

What happens to the pressure of the atria?

Answer 5

as atira contracts, blood will go through av valves, into ventricles, and u will get a sllight rise in pressure which will slightly drog again

the pressure in atria will be greater than in the ventricles bc the av valves are open

Question 6

What happens to the pressure of the ventricles?

Answer 6

when the ventricles contract, you will get a rise in pressure but then the pressure will drop (it will look like a hill) - this happens during ventricular systole

during ventricular diastole, it will continue to decrease in pressure

Question 7

What happens to the pressure in the aorta?

Answer 7

the aorta is narrower so the pressure will be higher - when the ventricles contract, it will force blood to stretch out which increases the pressure - the semi lunar valves will open

Question 8

When does the av valves close?

Answer 8

when the pressure in the atria drops

Question 9

When do the av valves open?

Answer 9

when pressure in atria and ventricles swap over so atria pressure increases - av valves open

Question 10

When do semi lunar valves close?

Answer 10

when pressure in the aorta increases