Active hyperemia differs from passive congestion because active hyperemia results primarily from:
Correct answer: D. Increased arterial blood flow
- A. Reduced venous drainage
- B. Reduced cardiac output
- C. Obstruction of lymphatic flow
- D. Increased arterial blood flow
Explanation
Active hyperemia is caused by arteriolar dilation and increased blood inflow, such as during exercise or inflammation. Passive congestion results from impaired venous outflow and often produces a bluish or dark red tissue.
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