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FIRST: Atrial contractions: - Right atrium forces the blood into the Right ventricle (through the tricuspid valve) - Left atrium forces the blood into the Left ventricle (through the the Mitral (or Bicuspid valve) FOLLOWED BY: Ventrical conctractions: - Right ventricle forces the blood into the Pulmonary trunk (through the Pulmonary semilunar valve) - Left ventricle forces the blood into the Aorta (through the Aortic semilunar valve). Contractions in both atrium happen simultaniously, just like contractions in both ventricles. More info can be found on http://en.wikipedia.org/wiki/Heart

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What are the four phases of cardiac cycle?

The four phases of the cardiac cycle are diastole, isovolumetric contraction, systole, and isovolumetric relaxation. During diastole, the heart muscles relax and the chambers fill with blood. In isovolumetric contraction, the heart muscles contract but the chambers do not change volume. Systole is when the chambers contract and blood is ejected. Finally, isovolumetric relaxation is when the heart relaxes but the chambers do not change volume.


During the normal cardiac cycle the artia contract when they are directly stimulated by the?

S A node


During what phase of cardiac cycle are all four chambers in diastole?

Once the ventricles contraction phase is over, the diastole starts. Then all the four chambers are in diastole, till the atria start to contract.


Which is the phase of cardiac cycle in which the auricles contract?

The auricles will contract during the systolic phase of the cardiac cycle. This is one of the numbers that is measured when a patient has their blood pressure taken.


The length of the normal cardiac cycle?

0.8 seconds


How does the heart contract or relax?

The heart contracts and relaxes during a cardiac cycle.


Relaxation of the ventricles is?

Is the beginning of the cardiac cycle when the ventricles start to relax all four chambers are in diastole.


Which is the phase of cardiac cycle in whitch the auricles contract?

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.


Which chambers contract during lub?

poop is generated


During which phase of the cardiac cycle do the ventricles relax and fill with blood?

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


What is the term that refers to the portion of the cardiac cycle when the ventricles contract and eject blood from the heart?

Systolic pressure


What is produced when the heart contracts?

What are you asking? The heat consists of 4 chambers (in humans) that contract (squeeze) and force blood through out the body, with the cycle constantly replenishing oxygen into the blood and delivering it to the rest of the body, returning the blood to the heat, and the cycle continues.