The polycythemia present in infants and children can best be explained as the body's response to:
1. Infection.
2. Oxygen need.
3. Bleeding.
4. Hypoglycemia.
2
Rationale:
1. Infection can increase the need for oxygen but does not result in polycythemia.
2. When a child is hypoxic, the kidney produces erythropoietin, signaling the marrow to produce more red blood cells.
3. Bleeding is controlled by platelets, not red blood cells.
4. Hypoglycemia has no effect on red blood cell production.
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