1. Which of the following best explains who hemoglobin reaches its nadir in neonates at 60 days of age? a. Erythropoietin is released from the kidneys around 30 days of age b. Erythropoietin increases bone marrow stimulation after birth c. Fetal red blood cells have a life span of approximately 30-45 days d. Rapid growth rates and bone marrow suppression lead to decreased red cell counts.
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The production of red blood cells $a$ ceases if the hematocrit falls below normal. $b,$ is stimulated by erythropoietin. $c .$ is about equal to the production of white blood cells. $d$. is inhibited by prothrombin. $e .$ occurs in bone marrow before birth and in lymph nodes after birth.
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