After spending 4 hours in the sun at the beach without sunscreen, your blood concentration of ________ has risen.

Name: After spending 4 hours in the sun at the beach without sunscreen, your blood concentration of ________ has risen.
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Question

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Erythropoietin is a hormone that stimulates the production of red blood cells in the bone marrow. Exposure to the sun's UV rays can cause an increase in erythropoietin production, as the body tries to increase oxygen delivery to sun-damaged skin.

After Spending 4 Hours in the Sun at the Beach