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18 Cards in this Set
- Front
- Back
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What is normal heart rate and amount of blood displaced each beat
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60 bpm and 75 ml of blood
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Function of the Coronary arteries
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To supply the heart with oxygen and nutrient
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What does inferior mean
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Bottom of heart
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What does superior
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Top of heart
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Where are atriums and ventricles
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Right atrium is on the left when looking at a heart, and left atrium is on the right when looking that the front of the heart. Atriums on top, and ventricles on the bottom left and right.
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What does the atria do?
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recieves blood from the veins as it returns from various organs
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What are ventricles and their function?
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Chambers of the heart that contract to create blood pressure
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Which side has higher blood pressure?
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The left chamber has thicker walls and creates higher blood pressure than the right
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When are ventricles relaxed? (2 times) Aka Ventricle pressure
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- When they atrio-ventricular valves are open
- When the semi-lunar valves are closed |
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When are ventricles contracted?
(2 times) Aka Arterial pressure |
- When the atrio-ventricular valves are closed
- When the semi-lunar valves are open |
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What is diastole?
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When all of the muscles in the heart are relaxed
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What is Atrial Distention?
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When the thin muscular wall of the atrium start to stretch from the blood filling it up
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Cardiac cycle of the heart step one, the relaxed heart.
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- All muscles of heart are relaxed
- Atrio-ventricular valves and semi-lunar valves are closed - Blood from the veins returns to the heart and begins to fill the Atria - Arterial blood will try to flow backwards but is then stopped by the semi-lunar valve. |
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Step 2, Atria filling with blood
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- The atria are filling with blood from the veins returning from the lungs and rest of body.
- Each atrium fills causing the thin muscular walls to stretch (Atrial distention) - Pressure in the atrium is increasing and will soon push open the atrio-ventricular valve. |
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Step 3, Atrial contraction
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- Atrial walls contract
- Blood pressure increases in the atria - Once atrial pressure is greater than ventricle pressure, the atrio-ventricular valves open - Blood begins the fill the ventricles - Ventricle blood pressure increases a little. |
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Step 4, Ventricles filling with blood
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- Blood fills teh ventricles
- Ventricle volume increases - Pressure increases but not enough to open the semi-lunar valve(s) |
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Step 5, Ventricles Contracting
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- The ventricles have filled with blood
- The walls contract (ventricular systole) - Ventricle volume decreases - Blood pressure increases - Atrio-ventricular valves close as ventricle pressure becomes greater than atrial pressure (1st heart sound) - Pressure increases quickly in the ventricles - When ventricle pressure is greater than arterial pressure, the semi-lunar valves open - A pulse of blood enters the arteries |
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Step 6, Ventricles relaxing
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- The ventricle walls relax (Ventricular diastole)
- Ventricle pressure falls - When arterial blood pressure becomes greater than ventricle blood pressure, semi-lunar valves close - Closing semi-lunar valves stops the backflow of blood - Closing the semi-lunar valves makes the second heart sound |
