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What is meant by systole and diastole?
The ventricles of heart have two states: systole(contraction) and diastole (relaxation). During diastole blood fills the ventricles and during systole the blood is pushed out of the heart into the arteries. The auricles contract anti-phase to the ventricles and chiefly serve to optimally fill the ventricles with blood.http://www.answers.com/systole
What is miocardia?
Miocardia is the decreasing heart volume during systolic contraction. The rhythmic contraction of the heart, especially the ventricles, via which the blood is returned/ pushed through the aorta and pulmonary artery after each diostole.
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.
What happens to A V valves during ventricular contraction?
As the ventricles of the heart contract the pressure in the ventricles rises beyond that of the atria. This pressure differential causes the AV valves to shut.
What are the bands of tissue on the atrioventricular valves of the ventricles?
The chordae tendinae are fibrous bands of tissue extending from the papillary muscles in the ventricles to the cusps of the AV valves (tricuspid and mitral). They serve to prevent the leaves of the valves from being pushed into the atria during ventricular contraction, preventing backward flow of blood in the heart.
When is blood ejected from the ventricles?
during the systole phase of the heart contraction.
When do the atria contact?
The atria contract during the cardiac cycle's atrial systole phase, which occurs just before the ventricles contract. This contraction helps push blood from the atria into the ventricles, completing the filling of the ventricles before they contract during ventricular systole. Atrial contraction is facilitated by electrical signals from the sinoatrial (SA) node, ensuring synchronized heart function.
What is meant by systole and diastole?
The ventricles of heart have two states: systole(contraction) and diastole (relaxation). During diastole blood fills the ventricles and during systole the blood is pushed out of the heart into the arteries. The auricles contract anti-phase to the ventricles and chiefly serve to optimally fill the ventricles with blood.http://www.answers.com/systole
Why is ventricular contraction wave larger?
You need more force to pump the blood to the lungs or the body than you do just to pump it to the next chamber. The atria pump to the ventricles. Easy. The ventricles need to pump the blood to the lungs (right ventricle) or the body (left ventricle) which calls for more pressure, hence a larger contraction wave.
What is the phase of ventricular contraction called?
It is called systole. This is when the ventricles contract and eject blood into the lungs (from the right ventricle) or into the systemic circulation (from left ventricle).
When do the bicuspid valves open and close?
The bicupid and tricuspid valves close during ventricular contraction. This prevents the backflow of blood from the ventricles to the atria.
What happens to A-V valves during ventricular contraction?
As the ventricles of the heart contract the pressure in the ventricles rises beyond that of the atria. This pressure differential causes the AV valves to shut.
The R wave of the ECG is most closely associated with which phase of the cardiac contraction cycle?
The R wave of the ECG is most closely associated with the depolarization of the ventricles during the cardiac contraction cycle, specifically with the QRS complex. This represents the initiation of ventricular contraction.
What is miocardia?
Miocardia is the decreasing heart volume during systolic contraction. The rhythmic contraction of the heart, especially the ventricles, via which the blood is returned/ pushed through the aorta and pulmonary artery after each diostole.
What are the three distinct stages of Cardiac Cycle?
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.
Does high preesure or low pressure open atrioventricular valves?
High pressure within the ventricles (during ventricular contraction) closes the atrioventricular valves and prevents the backflow of blood into the atria. Low pressure within the ventricles (during ventricular relaxation) allows the atrioventricular valves to open, allowing blood to flow from the atria into the ventricles.
what does atrioventricular valve do?
The atrioventricular valve acts as a control device between the atria and the ventricles. They prevent blood from moving back into the atria during contraction.
