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When atria relax ventricles do what?
When relaxed, the atria expand, and then the ventricles contract.
When is atrial and ventricle at rest together?
At diastole the muscles of the atria and ventricles relax and blood flows into the heart. Therefore the atria and ventricles and at rest together during diastole.
The relaxation phase of the heartbeat is called?
The relaxation phase of the heartbeat is called diastole. During diastole, the heart ventricles relax and fill with blood in preparation for the next contraction.
What is the phase in the cardiac cycle in which the ventricles relax between contractions?
The ventricles relax during diastole.
What is ventrical diastole?
Diastole is when the muscles of the atria and ventricles relax and blood flows into the heart.Ventricular diastole is when the muscles of the ventricles relax and blood flows into the heart. N.B It is called ventricular diastole and not ventrical diastole.
Describe how heart contraction and relaxation influence coronary blood flow?
When relaxation or diastole is occurring in the atria blood flows through the atria and the AV valves into the ventricles. When contraction or systole is occurring in the atria the remaining blood that doesn't flow through during relaxation is pushed into the ventricles. As the atria relax, the ventricles begin contracting; ventricular pressure rises, closing the AV valves. Ventricular pressure continues rising until it exceeds the pressure in the large arteries stemming from the ventricles. The SL valves are forced open and blood is expelled from the ventricles into the aorta and pulmonary trunk. During this phase the ventricles relax because the blood is no longer compressed in their chambers. Blood expelled into the aorta and pulmonary trunk backflows toward the heart, which then closes the SL valves. During the ventricle contraction the atria stays in relaxation, filling with blood and when blood pressure on the atrial side of the AV valves exceeds that in the ventricles, the AV valves are forced open and ventricular filling begin all over again.
Contrast the four events answered in (a) in terms of whether the ventricles contract or relax?
diastole.systolic to diastolicThe ventricles relax during diastole
The period during which the ventricles are repolarizing?
the asnwer is t wave
What muscles are The only muscles in the heart and makes up the atria and ventricles?
Cardiac Muscle or myocardium are the muscle that make up the heart that contract and relax to pump blood.
What are two main stages of heart beat and explain what occurs in each stage?
The two main stages of a heartbeat are diastole and systole. During diastole, the heart muscles relax, allowing the chambers to fill with blood; the atria fill with blood from the body and lungs, and the ventricles fill with blood from the atria. In systole, the heart muscles contract, pumping blood out of the ventricles: the right ventricle sends blood to the lungs for oxygenation, while the left ventricle pumps oxygen-rich blood to the rest of the body. These coordinated contractions and relaxations ensure efficient blood circulation throughout the body.
What is the significance of the delay in transmission at the AV node in the heart?
The transmission delay at the AV node in the heart allows both ventricles to relax and be refilled by the contracting atria. After the AV node delay, the ventricles contract and force blood into the aorta (systemic circulation).
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.
