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Questions and Answers
What occurs during the atrial systole phase of the cardiac cycle?
What occurs during the atrial systole phase of the cardiac cycle?
- Ventricular pressure drops significantly.
- Blood flows from ventricles to atria.
- Atria eject blood into ventricles. (correct)
- Semilunar valves open to release blood.
What is the approximate blood volume in the ventricles at the end of atrial contraction?
What is the approximate blood volume in the ventricles at the end of atrial contraction?
- 100 ml
- 50 ml
- 130 ml (correct)
- 200 ml
What happens to ventricular pressure during the isometric ventricular contraction phase?
What happens to ventricular pressure during the isometric ventricular contraction phase?
- Ventricular pressure rises until it exceeds arterial pressure. (correct)
- Ventricular pressure decreases gradually.
- Ventricular pressure becomes lower than atrial pressure.
- Ventricular pressure remains constant.
When do the semilunar valves open in the cardiac cycle?
When do the semilunar valves open in the cardiac cycle?
What occurs regarding blood volume during the ventricular systole phase?
What occurs regarding blood volume during the ventricular systole phase?
What does the end-systolic volume refer to in the cardiac cycle?
What does the end-systolic volume refer to in the cardiac cycle?
What is indicated by the stroke volume in the context of heart function?
What is indicated by the stroke volume in the context of heart function?
What is a significant change that occurs at the end of atrial contraction?
What is a significant change that occurs at the end of atrial contraction?
Flashcards
Atria Eject Blood into Ventricles
Atria Eject Blood into Ventricles
The phase where the atria contract, pushing blood into the ventricles, causing an increase in ventricular pressure and volume.
Atrial Systole Ends
Atrial Systole Ends
The end of atrial contraction, marked by the closure of the bicuspid and tricuspid valves, resulting in decreasing atrial pressure but a stable ventricular volume.
Isometric Ventricular Contraction
Isometric Ventricular Contraction
The phase where all heart valves are closed, ventricular pressure rises, and the heart muscles contract isometrically until ventricular pressure exceeds arterial pressure.
Stroke Volume
Stroke Volume
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End-Diastolic Volume
End-Diastolic Volume
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End-Systolic Volume
End-Systolic Volume
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Ventricular Systole
Ventricular Systole
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Diastole
Diastole
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Study Notes
Atrial Ejection of Blood
- Blood is propelled from the atria into the ventricles
- Pressure within the ventricles increases
- Blood volume increases to 130ml
Atrial Systole Conclusion
- Bicuspid and tricuspid valves close
- Atrial pressure decreases
- Ventricular blood volume increases further to 130ml
Isometric Ventricular Contraction
-
All valves (atrioventricular and semilunar) are closed
-
Ventricular pressure rises
-
Ventricular pressure surpasses arterial pressure
-
Semilunar valves open
-
Ventricles pump blood into aorta and pulmonary artery
-
Ventricular blood volume decreases to 50ml
-
Ventricular pressure remains higher than arterial pressure throughout ventricular systole
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