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21 Cards in this Set
- Front
- Back
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All the events related to the flow of blood through the heart during one complete heartbeat.
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cardiac cycle
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What opens and closes the heart valves?
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Pressure differences on the two sides of the valve.
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List the three phases of the Cardiac Cycle.
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1. Ventricular Filling, 2. Ventricular Systole, 3. Isovolumetric Relaxation
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Blood flows passively into the atria, through open AV valves, and into the ventricles.
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Ventricular Filling: Passive
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Atria contract, forcing the remaining blood into the ventricles.
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Ventricular Filling: Atrial Contraction
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Ventricles contract and intraventricular pressure rises, closing the AV valves.
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Ventricular Systole: Isovolumetric Contraction
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Rising ventricular pressure forces semilunar valves open. Blood is ejected from the heart.
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Ventricular Systole: Ejection
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Ventricles relax and ventricular pressure drops. Blood backflows, closing semilunar valves.
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Isovolumetric Relaxation
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True or false: Blood passes through the bicuspid valve at the same time blood is also passing through the tricuspid valve.
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True
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What closes the AV valves?
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A greater pressure in the ventricles compared to in the atria.
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What opens the semilunar valves?
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Increased ventricular pressure
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What closes the semilunar valves?
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A greater pressure in the arteries compared to in the ventricles.
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What opens the AV valves?
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A greater pressure in the atrium compared to in the ventricles.
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True or false: The right side of the heart contracts, then the left side of the heart contract.
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False
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What is the relationship between pressure inside a chamber of the heart and the state of the heart muscle (relaxed or contracted)?
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When a chamber of the heart contracts, pressure increases and when the chamber relaxes, pressure decreases.
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Blood always moves from ____ pressure to ____ pressure.
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high
low |
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What causes heart valves to open and close?
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Pressure changes
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During the Isovolumetric Contraction phase, are the AV valves and Semilunar valves opened or closed?
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AV valves are CLOSED
Semilunar valves are CLOSED |
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During the Isovolumetric Relaxation phase, are the AV valves and Semilunar valves opened or closed?
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AV valves CLOSED
Semilunar valves CLOSED |
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During the Ventricular Ejection phase, are the AV valves and Semilunar valves opened or closed?
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AV valves CLOSED
Semilunar valves OPEN |
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During the Ventricular Filling phase, are the AV valves and Semilunar valves opened or closed?
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AV valves OPEN
Semilunar valves CLOSED |
