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When atria relax ventricles do what?

When relaxed, the atria expand, and then the ventricles contract.


What chambers are the pumping chambers of heart?

ventricles


Primary pumping chamber of the heart?

ventricles


The pumping chambers of the heart that deliver blood to the lungs and body tissues are called the?

Ventricles


Does the septum contribute to the pumping action of the ventricles?

yes


What are the four different chambers of the heart called?

Left & right ventricles and auricles. (The ventricles are the bigger ones that do the actual pumping.)


When the ventricles are relaxed are the semilunar valves open or closed when the AV valves are open?

When the ventricles are relaxed, the semilunar valves are closed, while the atrioventricular (AV) valves are open. This allows blood to flow from the atria into the ventricles. The closure of the semilunar valves prevents backflow of blood from the arteries into the ventricles during this phase.


What happens when ventricales contracts?

When the ventricles contract, they pump blood out of the heart and into the arteries for circulation throughout the body. This contraction is part of the cardiac cycle and is responsible for the main pumping action of the heart.


Is the Systolic pressure is a measure of blood pressure when the ventricles relax and fill with blood?

No. I think the systolic pressure is when ventricles constrict and the blood goes out , while the diastolic pressure is when ventricles relax and fill with blood.


How many pumping chambers are there in the heart?

the human heart contains four chambers and it is the ventricles (the two lower chambers) that do the pumping


Why it is important that the ventricles are bigger and thicker than the atria?

ventricles are the pumping chambers of the heart, so they have to be thicker and bigger to exert enough force to perform their function.


What occurs when ventricular diastole takes place?

Ventricle diastole is the period during which the ventricles are relaxing. During ventricular diastole, the pressure in the (left and right) ventricles drops from the peak that it reaches in systole. When the pressure in the left ventricle drops to below the pressure in the left atrium, the mitral(bicuspid) valve opens, causing accumulated blood from the atrium to flow into the ventricles.