The circulatory system — Biology STD 10 — Question
ICSE BoardEnglish MediumSTD 10BiologyThe circulatory system1 Mark
MCQ
The life span of an RBC is:
✓
120 days
B
220 days
C
20 days
D
2 weeks
✓
Answer
Correct option: A.
120 days
(a) 120 days Explanation: The life span of a red blood cell (RBC) or erythrocyte is about 120 days or approximately 4 months. These cells circulate through the body, delivering oxygen to tissues and organs before they are broken down and recycled by the spleen and liver. The number 120 days is a mean value, with some cells living slightly longer or shorter.
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