In which body system are red blood cells (RBCs) manufactured?
a. Circulatory
b. Endocrine
c. Reproductive
d. Skeletal
d
FEEDBACK: a. Incorrect. The circulatory system transports RBCs but does not manufacture them.
b. Incorrect. The endocrine system manufactures hormones, not RBCs.
c. Incorrect. The reproductive system manufactures sex cells and hormones, not RBCs.
d. Correct. The skeletal system manufactures RBCs.
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