Human red blood cells are formed mainly in the ______.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. bone marrow.
Human red blood cells are formed mainly in the red bone marrow. This spongy tissue is found within certain bones, such as the flat bones (like the ribs, sternum, skull, and pelvis) and the ends of long bones in adults.
Within the red bone marrow, specialized stem cells called hemocytoblasts differentiate and undergo a process called erythropoiesis to develop into mature red blood cells. This continuous process ensures a steady supply of red blood cells to transport oxygen throughout the body.