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Questions and Answers
What factors influence venous return, in addition to systemic filling pressure?
What factors influence venous return, in addition to systemic filling pressure?
- Muscle fiber length and heart rate
- Resistance to flow and right atrial pressure (correct)
- Blood volume and blood viscosity
- Cardiac output and stroke volume
Under normal, nonstressed conditions, what determines stroke volume (SV)?
Under normal, nonstressed conditions, what determines stroke volume (SV)?
- Muscle fiber length
- Blood pressure
- Heart rate
- Venous return (correct)
What happens to the force of ventricular contraction in the failing heart?
What happens to the force of ventricular contraction in the failing heart?
- It becomes independent of ventricular filling
- It increases proportionally to ventricular filling
- It remains constant regardless of ventricular filling
- It decreases proportionally to ventricular filling (correct)
What does a breakdown of the Starling law lead to in the failing heart?
What does a breakdown of the Starling law lead to in the failing heart?
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What is the primary determinant of stroke volume under normal conditions?
What is the primary determinant of stroke volume under normal conditions?
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