Blood is Produced in Bone Marrow
Bone marrow is the key, with most of the blood being produced in “…the long bones in the arms, legs, back, and sternum. Bone marrow has yellow marrow, which contains fat, and red marrow, which contains hematopoietic (blood-forming) stem cells.” Wanda Lockwood - Which Part of the Body Makes Blood
Your bone marrow creates all the red blood cells, nearly all your white blood cells, and all of your platelets.
“Both the red and white blood cells arise through a series of complex, gradual, and successive transformations from primitive stem cells, which have the ability to form any of the precursors of a blood cell.” Science - Encyclopedia Britannica
Kidneys Play an Important Role
But how does the body know when it’s running low on red blood cells? Oddly, it’s the kidneys that are designed to detect when oxygen is low and to send a message to the bone marrow to up the blood production. It’s a precise, constant communication inside your body, balanced to keep you running in optimum health.
So next time you donate blood, remember you’re giving a “bone-fide” Gift of Life!