Differences Between Red Blood Cells (RBC) and White Blood Cells (WBC) : SSC CGL Biology Notes

Red Blood Cells/ Corpuscles (RBC) are also called “Erythrocytes” while White Blood Cells/ Corpuscles (WBC) are also called “Leukocytes”.

S.N.	Differences	Red Blood Cells/Corpuscles (RBC)	White Blood Cells/ Corpuscles (WBC)
1	Also called	Also called “Erythrocytes”	Also called “Leukocytes”
2	Origin	They are produced in red bone marrow.	Mostly bone marrow, also produced in lymph nodes, spleen, etc.
3	Nucleus	Nucleus Absent	Nucleus Present
4	Size	Smaller than WBCs, 7.5µm	Larger than RBCs, 15µm
5	Color	Filled with hemoglobin (Red)	Colorless, No Pigment
6	Production	2 million RBCs per second	Fewer WBC than RBCs
7	Life Span	RBCs have an average lifespan of 120 days	WBCs live anywhere from a few days (5-21 days)
8	Number	5 million RBCs in every cubic mm of blood	3,000 – 7,000 WBCs in every cubic mm of blood
9	Number Increments	Number increases during exercises and high altitudes	Number increases during infection
10	Process of Formation	Formation of RBC is called “Erythropoiesis”	Formation of WBS is called “Leucopoiesis”
11	Shape	Circular, Biconcave	Rounded and Amoeboid, Irregular
12	Motility	Non-Motile	Generally Motile
13	Movement	Doesn’t leaves Blood Vessels	Come out of blood Capillaries
14	Rouleaux Formation	Form stacks called Rouleaux	Rouleaux formation absent
15	Types	One Type	Five Types
16	Circulatory system	Cardiovascular system	Cardiovascular and lymphatic systems.
17	Function	Transport of Respiratory Gases (Oxygen and Carbon Dioxide)	Defense Mechanisms