What causes a higher stroke volume?
Increased afterload
Decreased heart contractility
Increased preload
Decreased blood pressure
The Correct Answer is C
A. Increased afterload: Increased afterload, the resistance the heart must overcome to eject blood, typically reduces stroke volume because the heart has to work harder to push blood against higher pressure.
B. Decreased heart contractility: This would reduce stroke volume, as the heart would be less effective at pumping blood.
C. Increased preload: Preload refers to the volume of blood in the ventricles at the end of diastole. An increased preload stretches the heart muscle, which typically leads to a stronger contraction and higher stroke volume.
D. Decreased blood pressure: While low blood pressure may reduce afterload, it doesn't directly increase stroke volume unless other factors are at play.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Expiratory reserve volume: This is included in the calculation of vital capacity (VC = TV + IRV + ERV).
B. Tidal volume: This is also included in vital capacity.
C. Residual volume: The residual volume is the air that remains in the lungs after a forced exhalation and is not part of the vital capacity.
D. Inspiratory reserve volume: This is included in the calculation of vital capacity.
Correct Answer is A
Explanation
A. Tunica vaginalis, tunica albuginea, seminiferous tubules: The tunica vaginalis is the outer protective layer, followed by the tunica albuginea (a tough fibrous layer), and then the seminiferous tubules, where sperm production occurs.
B. Tunica vaginalis, seminiferous tubules, tunica albuginea: The seminiferous tubules are deeper than the tunica albuginea, making this order incorrect.
C. Tunica albuginea, tunica vaginalis, seminiferous tubules: This reverses the outer layers, as the tunica vaginalis is superficial to the tunica albuginea.
D. Seminiferous tubules, tunica vaginalis, tunica albuginea: This order is incorrect, as the tunica vaginalis and tunica albuginea are external to the seminiferous tubules.
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