Tachycardia in a patient experiencing a sickle cell crisis represents a compensatory response that:
A. is caused by an acute increase in the red blood cell count.
B. attempts to force sickled cells through smaller vasculature.
C. is in response to an accelerated increase in hemoglobin levels.
D. maintains perfusion because the patient is spontaneously bleeding.
Answer: B. attempts to force sickled cells through smaller vasculature.
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