Answer: First option is correct.
Explanation:
Span of RBC (Red blood cells ) is 120 days.
It means RBC lives in the cell body for about 100-120 days.
So, it spend most of their time in the lymphatic system.
The lymphatic system contains spleen, bone marrow, lymph nodes and thymus.
The key element of lymphatic system is the red bone marrow.
And red blood cells (RBCs) are made in red bone marrow.
After 120 days, they are removed from the cycle of circulation from the lymphatic system.
Hence, Red blood cells spend most of their time in the lymphatic system.
Thus, First option is correct.
