The bone marrow is the primary location where red blood cells (RBCs) are produced.
While the question asks about a gland producing RBCs, the production of RBCs (erythropoiesis) actually occurs in the bone marrow. The process is regulated by the hormone erythropoietin (EPO). While EPO itself is produced by the kidneys (and to a lesser extent, the liver), the actual RBC production happens in the bone marrow. So while no gland directly produces RBCs, the kidneys, through the production of EPO, play a crucial indirect role.
Therefore, it is important to differentiate between a gland that produces a hormone regulating RBC production and the location where RBCs are actually made.
- Bone Marrow: The site of RBC production (erythropoiesis).
- Kidneys: Produce erythropoietin (EPO), the hormone that controls RBC production in the bone marrow.
In summary, the bone marrow is where red blood cells are made, under the influence of the hormone erythropoietin, which is produced by the kidneys.
