The amount of blood ejected from the heart per beat
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What is Diastole?
As pressure builds in the atria, the atrioventricular valves open and blood flows into the relaxed ventricles. However, it does not flow into the aorta or pulmonary artery due to the semilunar valves.
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What is the first stage of diastole?
This is the period when the ventricles and atria are contracting, allowing blood to flow out of the heart.
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What is the second stage of diastole?
This is the period when the ventricles and atria are relaxed, allowing blood to flow into them
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What is systole?
The atria relax, allowing blood to flow into them. The atrioventricular valves are shut at this point which prevents blood flow into the ventricles
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What is the first stage of systole?
Electrical impulses which are sent around the heart
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What is the second stage of systole?
The sino-atrial node sends an impulse across the atria which stimulates them to contract.
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What is the cardiac system controlled by?
The atria contract, allowing any remaining blood to flow into the ventricles.
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What is the 1st stage of the pathway to get the electrical impulses sent around the heart?
The ventricles contract which raises the blood pressure and forces open the semilunar valves. This allows blood to be forced out of the aorta (to the body) and the pulmonary artery (to the lungs)
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What is the 2nd stage of the pathway to get the electrical impulses sent around the heart?
The impulse travels along the Purkinje fibres which branch along the base of the right and left ventricles and cause the ventricles to contract
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What is the 3rd stage of the pathway to get the electrical impulses sent around the heart?
The impulse travels down the bundle of His located in the septum.
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What is the 4th stage of the pathway to get the electrical impulses sent around the heart?
The impulse arrives at the atrioventricular node, where it is delayed, allowing the ventricles to fully fi
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The impulse travels down the bundle of His located in the septum.
The impulse travels down the bundle of His located in the septum.
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The impulse travels down the bundle of His located in the septum.
The impulse travels down the bundle of His located in the septum.
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