Difference Between Rbc And Wbc

This may indicate a difference between Rbc And Wbc that red blood cells play a role in the oxygen-carrying capacity of the blood, whereas white blood cells play a role in the body’s immune system. They are the main components of blood, but both are totally different. Blood consists of two basic components, plasma, and blood cells. Blood cells are categorized into three types, namely, red blood cells, white blood cells, and platelets. Red blood cells make up 35 to 50% of the total blood volume, while white blood cells make up 1% of the blood. RBCs do not have any type but WBCs can be categorized into the following 5 types listed below:

  • Neutrophils
  • Macrophages
  • Monocytes
  • Basophils
  • Eosinophils
  • And lymphocytes.

Red blood cells and white blood cells are completely different entities in all respects, they are derived from the same blood stem cell.


Red blood cells play a major role in the oxygen-carrying and transmission of blood. White blood cells play a vital role to protect the body against foreign invaders, i.e., microorganisms (bacteria, viruses, fungi, etc.). Red blood cells contain hemoglobin, which gives a red color, and due to the color of the red blood cells, the whole blood appears red. While white blood cells do not contain hemoglobin, so they are colorless. RBCs are synthesized in the bone marrow, while WBCs are formed in the spleen and lymph nodes. The number of WBCs produced in the body per second is very small while about 2 million RBCs are produced per second. The number of RBCs is 4.5 million per cubic mm in females and 5.5 million per cubic mm in males. The number of WBCs ranges from 4100 to 11000 per cubic mm.

How blood cells are made?

The formation process of new RBCs is called erythropoiesis and the process of formation of WBCs is called leukopoiesis.  the average lifespan of red blood cells is 120 days, the life of WBCs is not accurate. They can live in the body for many hours to many years depending on the health condition. The main function of RBCs is to transfer oxygen to all body cells, protecting the body from pathogenic cells invaded by WBCs. WBCs are an important part of our immune system.

What are Red Blood Cells?

They are responsible for the major types of cells that are produced in our blood. They are bright red due to the presence of hemoglobin, which is composed of heme and globin chains. Iron is the major component of heme. Due to this red hemoglobin, the whole blood appears red. The number of red blood cells is about 4.5 million per cubic mm in women and about 5.5 million per cubic mm in men. RBCs are also known as erythrocytes. They contain proteins rich in iron and hemoglobin that binds to oxygen and is red. If the body is iron deficient, the hemoglobin level in the red blood cells decreases, and this condition is called anemia. Fatigue, shortness of breath on Light exertion, and jaundice in the eyes and sometimes on the skin are the most common symptoms of RBCs. They are synthesized in the bone marrow. Erythropoiesis is the process of formation and maturation of red blood cells in the body. Various hormones secrete from the kidneys and cause the red blood cells to mature. When renal failure occurs in any patient, the number of RBCs is also reduced.

RBCs are small, round, and biconcave in shape in mature humans, however, they appear to be bell-shaped when passing through small vessels due to the flexibility of the cell. Red blood cells make up about 35% -50% of the whole blood in the body.

Functions of Red Blood Cells

RBCs perform various functions in the body, some are listed below:

  • RBCs are responsible to carry oxygen from the lungs or gills to the body tissue with the blood flow through the circulatory system.
  • It carries carbon dioxide and other waste products to the lungs, from where they are excreted.
  • The biconcave shape of the cells allows the exchange of oxygen over the maximum possible area at a constant speed.

What are White Blood Cells?

WBCs makeup 1% of the blood and play a role in our body’s immune system, and also protect the body from pathogens. WBCs are divided into five types: eosinophils, basophils, neutrophils, monocytes, and lymphocytes. WBCs produce in the lymph nodes, spleen, and thymus. It also circulates in the circulatory system as well as in the lymphatic system. The number of white blood cells is 4000 to 11000 per cubic mm of body. When their number is higher than normal, the condition is called leukocytosis, and when that number is lower than normal, the condition is called leukopenia.

See Also: White blood cells disorders

Functions Of White Blood Cells

  • These cells protect us from infectious and foreign organisms.
  • They flow through the bloodstream to fight viruses, bacteria, and other foreign invaders that threaten your health.
  • If the body is in distress and a particular area is under attack, WBCs help destroy the harmful substance and prevent illness.


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