When looking at the dynamics of the left side of the human heart: How much press
ID: 3517062 • Letter: W
Question
When looking at the dynamics of the left side of the human heart: How much pressure does the atrium develop? How much does the pressure in the atrium change? Why is the maximum pressure in the atrium so low? Compare the pressure in the left ventricle to the pressure in the atrium? Why is the pressure in the left ventricle so high? Compare to the pressure in the right ventricle. The pressure in the right ventricle reaches a maximum of about 25 mm Hg. Why is the maximum pressure in the right ventricle so much lower than the maximum pressure in the left ventricle? How does ventricular pressure change during the cycle from the start of one contraction to the start of another contraction? How does the aortic blood pressure change during this cycle? What is a pulse?
Isovolumetric contraction Isovolumetric relaxation Ventricular ejection systole Ventricular filing Q?S Qis Ventricular mm Hg 120 kPa Aortic blood 16 100 80 Ventricular blood pressure 8 60 40 Atrial blood pressure 20 Atrio- ventricular Closed Open Closed valve 120 80 40 Ventricular 400 Ventricular outflow 200 0.4 Time(s) 0.2 0.6Explanation / Answer
Here is the pressure develop in each chambers of heart
Atrial pressure in systole is 4 to 8 mm of hg
Left ventricular systolic pressure is 120 mm of Hg
Right ventricle systolic pressure is 25 mm of Hg
Pressure change in the atrium
The diastolic pressure in atrium is 0 to 3 mm of Hg when it contract it changes to 4 to 8 mm of Hg in.systole
Max pressure in the atrium is so low because it just have to pump the blood to ventricles that are just present underneath.no.greater force or pressure required for that.
Pressure in the left ventricle is 120 and in atrium is 8 .left ventricle pressure is very high as compare to.the atrial pressure.pressure in.the left ventricle is so high because it has to pump blood to systemic circulation that is to whole body.moreover the muscles of ventricles are thicker than atrium.
Pressure in the right ventricle is 25 mm of Hg.which is low as compare to pressure in the left ventricle.this is because the left ventricle muscles are three times thicker than right ventricle muscle.moreover right ventricle has to pump blood to lungs only whereas left ventricle pump.blood to.whole body.
Pressure change in ventricle
First just after the closure of mitral valve the pressure is 5 mm of Hg.then there occurs the iso volumetric contraction and ejection phase .pressure rises to 120 mm of Hg at mid of ejection phase after which it starts falling.after ejection ohase there is isi volumetric relaxation phase at the end of which the pressure becomes zero.after which the mitral valve open and there occurs the filling phase of ventricle at the end of which the pressure becomes 5 mm Hg from 0 mm of Hg.
Change in aortic pressure
The diastolic pressure in aorta is 80 mm of Hg.at the starting of Iso volumetric contraction.the pressure in aorta doesn't change in this phase .then there is ejection phase in which pressure in aorta increases and reaches max at 120 mm of Hg at mid of ejection phase.then it starts falling .at the end of ejection phase and starting of isovolumetric relaxation phase pressure slightly rises and fall giving a dichrotic notch due to the back flow of blood in aorta.then at pressure falls and becomes 80 mm again at the end of iso volumetric relaxation phase and remains 80 upronext cycle.
Pulse is defined as the rythmic pulsations felt in arteries due to the beating of heart.
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