life span of blood and sperm
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Blood
Human red blood cells are formed mainly in the bone marrow and are believed to have an average life span of approximately 120 days.
Sperm
The life span of sperm after ejaculation depends on the circumstances. Ejaculated sperm remain viable for several days within a woman's reproductive tract or in nutritive liquid (culture medium) in a lab setting. Fertilization is possible as long as the sperm remain alive — at least five days.
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