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Questions and Answers
What is afterload?
What is afterload?
- The amount of blood in the ventricles before they contract
- The force of blood against the walls of the veins
- The resistance that the ventricles have to overcome to pump out the blood through the aorta (correct)
- The pressure in the atria when the ventricles contract
What increases end systolic volume (ESV)?
What increases end systolic volume (ESV)?
- Preload
- Afterload (correct)
- Blood viscosity
- Arterial wall rigidity
What factors contribute to afterload?
What factors contribute to afterload?
- Venous pressure, arterial wall rigidity, and blood volume
- Aortic pressure, arterial wall rigidity, and blood viscosity (correct)
- Venous pressure, arterial wall flexibility, and blood volume
- Aortic pressure, arterial wall flexibility, and blood viscosity
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Study Notes
Afterload
- Afterload is the tension or stress that the heart must generate to eject blood into the aorta during systole.
Factors Contributing to Afterload
- End systolic volume (ESV) is increased by: • Increased peripheral resistance • Increased blood pressure • Stiffening of arteries • Decreased arterial compliance
Note: Peripheral resistance, blood pressure, and arterial stiffness all contribute to increased afterload, making it more difficult for the heart to pump blood.
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