Ratio of WBC to RBC in human blood is

The correct option is D

1:600

The correct option is D.

The explanation for the correct option:

1. The ratio of WBC to RBC in human blood is 1:600.
2. White blood cells are an integral part of the Human immune system which help us to fight any infection.
3. The usual WBC count is less but when the body is infected with a virus or any pathogen WBC count raises.
4. Red blood cells have numerous functions from carrying blood and oxygen to and from the lungs to transportation of energy and hormones.
5. Thus we need a larger number of RBCs.

The explanation for the incorrect options:

Option A:

1. 1:100 This ratio indicates a lesser number of RBCs in the body.
2. Such a condition is very dangerous as it will lead to haemoglobin deficiency and a condition called anaemia or polycythemia.
3. The normal metabolism of the body gets affected.

Option B:

1. 1:200 – RBC count is way too less than normal.
2. Such a condition is very dangerous as it will lead to haemoglobin deficiency and a condition called anaemia or polycythemia.
3. The normal metabolism of the body gets affected.

Option C :

1. 500:1 – under normal conditions WBC count is never more than RBC.
2. A higher number of WBC indicates some kind of pathogenic infection or inflammation in the body.
3. Leukocyte for WBC only increases themselves while fighting certain kinds of disease.

Final answer: The ratio of WBC to RBC is 1:600 in human blood.