Question

Where are red blood cells made?

1.Kidneys

2.Heart

3.Joints

4.Bone marrow

Answer 1

Answer:

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Heart......

Production of red blood cells is controlled by erythropoietin, a hormone produced primarily by the kidneys. Red blood cells start as immature cells in the bone marrow and after approximately seven days of maturation are released into the bloodstream.....

Red blood cells are formed in the red bone marrow of bones. Stem cells in the red bone marrow called hemocytoblasts give rise to all of the formed elements in blood.....

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Answer 2

Answer:

Option 4 is right answer Bone marrow.

Explanation:

Red blood cells are formed in the red bone marrow of bones. Stem cells in the red bone marrow called hemocytoblasts give rise to all of the formed elements in blood.