Nokea
Peripheral vascular resistance can be best gauged by
- A. pulse pressure as it corresponds to aortic compliance
- B. mean arterial pressure as it supplies blood to periphery
- C. diastolic blood pressure as it leads to the decreased pressure
- D. systolic pressure as it causes an increase in the descending aorta
Correct Answer: C
Rationale: Peripheral vascular resistance (PVR) is best reflected by diastolic blood pressure, as it represents the baseline pressure maintained by arteriolar tone when the heart isn’t pumping. Pulse pressure reflects arterial elasticity, mean arterial pressure balances systole/diastole, and systolic pressure peaks with ventricular contraction, not resistance.
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- A. arteries
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- C. venules
- D. capillaries
Correct Answer: D
Rationale: Capillaries (D) are thin-walled, allowing gas, nutrient, and waste exchange between blood and tissues. Arteries (A), arterioles (B), and venules (C) transport, not exchange.
The contraction of the heart muscle is called
- A. diastole
- B. peristalsis
- C. systole
- D. spasm
Correct Answer: C
Rationale: Systole (C) is heart muscle contraction (atrial or ventricular). Diastole (A) is relaxation, peristalsis (B) is GI movement, and spasm (D) is involuntary contraction.
Substance that hydrolyzes fibrin strands and dissolves blood clots
- A. Thrombin
- B. Fibrinogen
- C. Plasmin
- D. Heparin
Correct Answer: C
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In a healthy young adult, what happens to cardiac output when heart rate increases above 160 bpm?
- A. It increases
- B. It decreases
- C. It remains constant
- D. There is no way to predict
Correct Answer: B
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A patient who is recovering from a myocardial infarction may benefit from meditation because this technique:
- A. decreases sympathetic nervous system activity
- B. decreases vasodilation
- C. increases sympathetic nervous system activity
- D. increases the release of catecholamines
Correct Answer: A
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