diastole is when all 4 chambers of the heart are at rest after a cardiac cycle systole is the term used to describe the heart during a contraction
The ventricles relax during diastole.
The three distinct stages of the Cardiac Cycle are diastole, isovolumetric contraction, and systole. During diastole, the heart relaxes and fills with blood. In isovolumetric contraction, the ventricles start to contract but there is no change in volume. Systole is when the ventricles fully contract to pump blood out of the heart.
The phase of the cardiac cycle in which the atria contract is called atrial systole. This occurs during the P wave on an ECG and helps to push blood from the atria into the ventricles.
Systolic pressure
The relaxing phase of the cardiac cycle is called diastole. During diastole, the heart chambers (atria and ventricles) relax, allowing them to fill with blood. This is followed by the contracting phase called systole.
The T wave on an ECG reading is the last wave in the cycle, and it represents the repolarisation of the heart. This means that the ventricles have just contracted sending blood around the body, and the heart is now 'resetting' itself ready for the next cycle.
During ventricular relaxation, the A-V valves (tricuspid and mitral valves) remain closed to prevent the backflow of blood from the ventricles into the atria. This closure helps maintain the direction of blood flow through the heart and ensures efficient filling of the ventricles during the next phase of the cardiac cycle.
Systole refers to the phase of the cardiac cycle when the heart muscle contracts and pumps blood out of the chambers and into the circulatory system. This is when the blood pressure is at its highest during the heartbeat.
Is the beginning of the cardiac cycle when the ventricles start to relax all four chambers are in diastole.
The valves in the auricles (atria) and ventricles of the heart ensure unidirectional blood flow throughout the cardiac cycle. The atrioventricular valves (tricuspid and mitral) prevent backflow of blood from the ventricles to the atria during contraction, while the semilunar valves (pulmonary and aortic) prevent backflow from the arteries into the ventricles during diastole. This coordinated function is crucial for efficient circulation and maintaining proper blood pressure within the heart and vessels.
Pulmonary and aortic valves are semilunar valves having three semilunar cusps each. these valves open with the free ends facing the vessels when the heart contracts and closes when heart relaxes thus preventing regurgitation
When the pressure in the ventricles becomes lower than the pressure in the atria, the atrioventricular (AV) valves open. This allows blood to flow from the atria into the ventricles, filling them in preparation for the next heartbeat. This occurs during the diastolic phase of the cardiac cycle, facilitating efficient blood circulation throughout the heart.