alleryStart learning →After donating about 475 mL of blood, how long does the body take to replace the plasma and the blood cells?
APlasma in 24 hours, cells in 4 to 6 weeks
BPlasma in 4 weeks, cells in 24 hours
CPlasma in 6 hours, cells in 2 to 3 days
DPlasma in 1 week, cells in 6 months
Answer & Solution
Correct answer: A. Plasma in 24 hours, cells in 4 to 6 weeks
1. Plasma is mostly water plus proteins, and both are replaced quickly.
2. Donated plasma is typically restored within 24 hours.
3. The formed elements have to be built through the whole hemopoietic sequence, which takes about 4 to 6 weeks.
4. That slower half of the answer is what sets the minimum interval between donations.
5. The reversed option puts the fast figure on the cells, which would imply a full marrow cycle in a day.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.2 Production of the Formed Elements_
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