Question

The ratio of RBC to WBC in man is
a. 6:1
b. 60:1
c. 600:1
d. 6000:1

Answer 1

Blood consists of plasma and formed elements. There are three types of formed elements present in blood namely:-

Red blood cells or RBCs :- they are the most abundant cells in blood . Their number ranges from
5million to 5.5million of RBCs 𝑚𝑚−3 𝑜𝑓 𝑏𝑙𝑜𝑜𝑑
They are biconcave in shape and are without nucleus.
White blood cells or WBCs :- they are lesser in number as compared to red blood cells. Their number ranges from 6000-8000 𝑚𝑚−3 𝑜𝑓 𝑏𝑙𝑜𝑜𝑑.
These possess nuclei and can move in an amoeboid manner.
Blood platelets

Complete answer:
6:1 :- RBCs are million in numbers and WBCs are thousands in number so the ratio can’t be this much less hence this option is not correct.
60:1 :- RBCs are much more in number than WBCs . They are hundred times more in number as compared to WBCs . Hence the option goes wrong.
600:1 :- when we find a ratio of 5.5 million RBCs to 8000 WBCs . The ratio comes out to be this. So the option is correct.
6000:1:- The RBCs are only 100 times that of WBCs . Hence this option is not correct as the ratio is a thousand times.

Our correct ans is c that is 600:1.

Note:

Blood platelets are also known as thrombocytes.
They are the smallest of the formed elements.
Their number ranges from 150000 to 350000 $m{m^{ - 3}}$ of blood.
They play an important role in blood clotting during an injury.