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Pressure changes during the cardiac cycle. Ventricle systole. Atrial systole. N. L. P. Diastole. What is happening at L-M. L: Ventricular systole starts Ventricular pressure greater than atrial pressure. Therefore AV valves shut. M: Ventricular systole

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Ventricle systole

Atrial systole

N

L

P

Diastole

what is happening at l m
What is happening at L-M

L: Ventricular systole starts

Ventricular pressure greater than atrial

pressure.

Therefore AV valves shut.

M: Ventricular systole

Pressure in ventricle exceeds that in aorta

Semilunar valves open

Blood enters aorta.

what is happening and n and p
What is happening and N and P

N: Start of ventricular diastole

Ventricular pressure less than aortic pressure

Semilunar valves shut

Preventing backflow of blood into ventricles

P: Ventricular diastole

Pressure in ventricle drops below atrium

AV valves open

Blood enters ventricle

why is the max pressure in the left atrium lower than max pressure in the left ventricle
Why is the max pressure in the left atrium lower than max pressure in the left ventricle?
  • Ventricle has thicker muscle wall
  • Generates a higher pressure as it contracts
  • Pumps blood a greater distance then atria