A hormone used by competitive athletes to increase the oxygen-carrying capacity of their blood is _____________.

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Erythropoietin is a hormone that stimulates the production of red blood cells in the bone marrow, leading to an increase in the oxygen-carrying capacity of the blood. Competitive athletes may use erythropoietin to enhance their endurance and performance in aerobic activities. Oxytocin is involved in social bonding and maternal care, while glucagon increases blood glucose levels. Norepinephrine and serotonin are neurotransmitters that affect mood and emotions.

A Hormone Used by Competitive Athletes to Increase the Oxygen-Carrying