NEET'22 Crash Course

Detailed Study of Blood Cells

Blood cells are the main components of blood in a living body. Blood can be defined as a circulating fluid that is constantly providing our body with oxygen and nutrition. The consistency of blood is mostly in the liquid form and there are numerous proteins and cells suspended in blood. Hence, the entire texture of blood tends to be a bit thicker than the consistency of pure water. There are about 5 litres of blood in an average person. 

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There is a liquid known as plasma that is another major constituent of blood. Plasma is rich in protein that allows the blood to transport, clot, and take substances through the system along with performing some other functions as well. The plasma in the blood is also pretty rich in nutrients such as glucose. In this article, students will learn about blood and the origin of blood cells along with some other details. 

What are Blood Cells? 

A major component in the blood is the blood cells. There are 3 different types, known as red blood cells, white blood cells, and platelets. The blood is transported and conducted with the help of blood vessels such as arteries and veins. 

By looking at a picture of blood, students will be able to study the entire structure and read all about the related details as well. In certain cases, the blood might have some clotting issues in the blood vessels. In case the blood vessels are smooth, the clotting factors can easily be tuned. 

Different Blood Conditions

There are different medical conditions related to the blood inside a living body. Some of these conditions include haemorrhage, hematoma, leukaemia, multiple myeloma, lymphoma, etc. These conditions have a pretty serious nature and can lead to the loss of lives. There are some other conditions such as anaemia, hemolytic anaemia, hemochromatosis, sickle cell disease, bacteremia, malaria, thrombocytopenia, DIC or Disseminated Intravascular Coagulation, Leukopenia, Hemophilia, Myocardial Infarction, and many other such conditions. 

What are Blood Vessels? 

Blood vessels can be defined as the channels or distributaries through which blood is transported throughout the entire body. There are three sections of blood vessels and they are arteries, capillaries, and veins. The main function of arteries is to take the blood away from the heart and transport it. The capillaries act as the connection between the main vessels and help in the process of transportation. Veins on the other hand carry all the blood towards the heart. This picture of blood vessels provides a detailed explanation of the three different types.  

What are the Different Types of Blood Cells? 

There are three different types of blood cells in the body and they make up almost half of the blood composition. Here is a picture of blood cells to clear the topic better. 

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Different Blood Cells in the Body

  • Red Blood Cells 

Red blood cells are also known as erythrocytes. These are the most abundant ones of the blood cells in the human body. These account for about 40-45% of the entire blood in the body. The shape of the red blood cells is biconcave and it is round as well as flat. The disc diameter tends to be about 6.2-8.2 µm and there is no nucleus present in the red blood cells. RBCs are rich in haemoglobin and provide a red colour in the blood. Red blood cells tend to last up to 4 months or 120 days in total before new formation takes place. Males produced 4.3-5.9 million/mm3 of RBCs and Females produced 3.5-5.5 million/mm3 of RBCs. 

Some of the main functions of red blood cells include the transportation of oxygen from the lungs to other cells in the body. These cells also help in picking up CO2 from other tissues so that it can be unloaded in the lungs. 

  • White Blood Cells 

These cells form just about 1% in total of the blood in the body. These cells are responsible for the immune system of the body and hence are responsible for protecting the body against certain foreign substances as well as infections. The creation of white blood cells happens in the bone marrow. The different types of white blood cells include neutrophils, Eosinophils, Basophils, Lymphocytes, and Monocytes. The main functions of blood cells that are white are to kill bacteria and other viruses that enter the body and to provide the body with proper immunity. 

  • Platelets 

Thrombocytes or platelets are the third component of the blood cells. There is no nucleus present in the platelets. After careful study of a picture of blood circulation in human body, students will be able to learn more about platelets. These are small fragments of the cells in the bone marrow. There are about 150,000–400,000 platelets present in a microliter of human blood. The main functions of platelets are to clot the blood. These cells also help in promoting other mechanisms of blood clotting. These also help with the secretion of chemicals that attract monocytes and neutrophils to different inflammatory sites. 


The above-mentioned article attempts to provide a detailed explanation of the blood cells that are present in the human body. Students can read the article and study the picture of blood cells in order to know more. 

FAQs (Frequently Asked Questions)

1. What are blood cells?

Everyone knows that blood is a major component in the body of a living human. It is a liquid that is constantly circulating inside the body to provide proper nutrition and oxygen to living beings. There are components that help in the composition of blood in the body. One of the components is the Plasma and the other is known as a blood cell. The blood cells help in the creation of blood along with the plasma. The blood cells are of three different types and they help in different processes that happen in the body. The three different types of blood cells include red blood cells, white blood cells, and platelets. 

2. What are blood vessels? 

When you study the picture of blood, you will see that there are certain channels running through the entire body. These channels help in the transportation of blood from the heart to the different organs of the body and vice-versa. These channels or distributaries are known as blood vessels. There are three sections of blood vessels: the arteries, veins, and capillaries. The arteries help in transporting the blood away from the heart. The capillaries are interconnected with other blood vessels and help in the process of blood transportation. The veins help in bringing the blood from different organs back to the heart.