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 D
Explanation
A. Eosinophil: Eosinophils are involved in allergic reactions and parasitic infections, but they are not responsible for B and T cell functions.
B. Basophil: Basophils are involved in inflammatory responses, particularly releasing histamine, but do not include B or T cells.
C. Monocyte: Monocytes are large white blood cells that develop into macrophages but do not include B or T cells.
D. Lymphocyte: Lymphocytes are a subtype of white blood cells that include B cells (which produce antibodies) and T cells (which are involved in cell-mediated immunity), making this the correct answer.
Correct Answer is A
Explanation
A. Glomerulus: The glomerulus is a high-pressure capillary bed in the nephron where filtration of blood occurs.
B. Bowman's capsule: This is the cup-shaped structure surrounding the glomerulus, not a capillary bed.
C. Vasa recta: These are capillaries surrounding the loop of Henle, involved in the reabsorption process, not filtration.
D. Macula densa: This is a group of specialized cells in the distal convoluted tubule that sense sodium concentration and affect glomerular filtration rate, but it is not a capillary bed.
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