Some people get tired early wheras some people keep on working for a long time and they get tired after a long. If you have insufficient number of platelets and hemoglobin, you will definitely get tired early.
Platelets, also known as thrombocytes, are blood cells. They form in your bone marrow
RBC is red blood cells which flows the oxygen in the blood with the help of hemoglobin. In a normal active human RBC count should be 50 Lakh
WBC is white blood cell. In a normal active human, WBC should be 10000
In a normal active human platelets should be 2 Lakh
If RBC goes down, that means hemoglobin will be reduced and if hemoglobin is reduced, it will not flow enough oxygen in the body/veins.