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Where are the Red Blood Cells produced in the human body?

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Normal blood cells last for a limited time (ranging from a few hours to a few days for white blood cells, to about 10 days for platelets, to about 120 days for red blood cells) and must be replaced constantly. Certain conditions may trigger additional production of blood cells. read more

Human red blood cells are produced through a process named erythropoiesis, developing from committed stem cells to mature red blood cells in about 7 days. When matured, in a healthy individual these cells live in blood circulation for about 100 to 120 days (and 80 to 90 days in a full term infant). read more

Blood transfusion: A blood donor's red blood cells are separated from their plasma and packed into a small bag. Transfusing the concentrated red blood cells into a recipient replaces blood loss. Platelet transfusion: A blood donor's platelets are separated from the rest of blood and concentrated into a plastic bag. read more

Production of red blood cells is controlled by your kidneys signaling to your body to do this by generating a specific hormone. After that happens, they’re created in your body’s bone narrow, the soft tissue inside your bones, and are released into your body’s bloodstream from there. read more

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How does the human body produce blood? - Quora
Source: quora.com

Further Research

How Blood Works
health.howstuffworks.com

How Does The Body Make Blood?
indianapublicmedia.org

Human Anatomy: Blood
www.webmd.com

Red blood cell production
medlineplus.gov

Red Blood Cells
health.howstuffworks.com