SSC CGL
MediumQ. No. where-are-red-blood-cells-rbcs-produced-in-adults
Where are red blood cells (RBCs) produced in adults?
Last Updated:
ASpleen
BLiver
CRed bone marrow
DThymus
Correct Answer: Red bone marrowYour Answer: C
✅ Correct Answer: C — Red bone marrow
In adults, Red Blood Cells (RBCs) are produced in the Red Bone Marrow through a process called Erythropoiesis. Red bone marrow is found in flat bones (sternum, ribs, pelvis, skull, vertebrae) and the ends of long bones. The hormone Erythropoietin (EPO) from the kidneys stimulates RBC production when oxygen levels are low.
❌ Why other options are wrong:
• A. Spleen — In embryo/fetus, spleen produces RBCs but NOT in adults. In adults, spleen destroys old RBCs (graveyard of RBCs).
• B. Liver — Liver produces RBCs during fetal development (from 2nd to 7th month) but NOT in adults. In adults, liver destroys old RBCs and recycles haemoglobin.
• D. Thymus — Thymus is where T-lymphocytes mature; it does NOT produce RBCs at any age.
📝 Important Note: Adult RBC production = Red Bone Marrow (Erythropoiesis). Fetal RBC production = Liver and Spleen. RBC lifespan = 120 days. Destroyed in Spleen (adults). Hormone EPO from kidneys stimulates production. High altitude stimulates more RBC production. Key SSC CGL haematology fact.
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