What are the changes in blood pressure and blood flow that occur during contraction of the mammalian heart?
The contraction of the mammalian heart causes fluctuations in the cardiac pressure and the volume of blood in the heart. It is very important for the heart to maintain very specific blood pressure to ensure that the blood is being transferred all over the body and that the heart can repeat both stages of relaxation and contraction. If the blood pressure in the heart never dropped, there would be no relaxed state and the heart would not fill with blood returning from the body and the lungs. Therefore every change in blood pressure and flow is designed to pump blood. A quick review of the diastole stage, or relaxed state, of the heart will give you a better understanding of what is happening in the systole stage, or contracted state. In the diastole phase of the heartbeat, the aortic valve will be closed. This will cause a difference of pressure in the ventricles compared to the pulmonary arteries and aorta, which will enable the atrioventricular valves to open allowing blood to be flush
