What is the lifespan of red blood cells (RBCs) in humans?
The average lifespan of RBCs is 120 days before they are broken down in the spleen.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood - Plasma and Formed Elements
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Normal RBC lifespan in circulation is approximately:
Go with D — 120 days. Within Blood and their Component, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, 120 days is the option that correctly names the structure, process, or principle asked for in Blood and their Component. Holding that picture in mind makes 120 days feel natural rather than something you only memorise. Link the term to a real body example (organ, tissue, or ion flow) so the idea stays concrete under exam pressure. A short mental diagram helps — start from stimulus or structure, follow the pathway, and stop at the functional result described by 120 days.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.