Which cells have the lifespan of approximately 7.5 days and one-third of their population remains in the spleen (unless needed to fight significant bleeding)?

Platelets

Explanation:

Platelets have a lifespan of approximately 7.5 days. Two-third of their population circulate in the blood and contribute to homeostasis. The remaining one-third is stored in the spleen, where they remain unless needed in cases of severe bleeding.

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