Body Fluids and Circulation


Human body runs perfectly with many internal systems and mechanisms in place. We all know some of these systems such as the digestive, circulatory, nervous, respiratory, excretory systems etc. There is another important system called the lymphatic system and lymph itself which play a significant role in the functioning of the body.

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The Lymphatic System


(Source: Britannica)

The lymphatic system can be called as a subsystem of the circulatory system in vertebrates. It consists of a complex network of lymphatic vessels, tissues, and organs. The primary function of this system is to transport lymph throughout the body. It also helps in maintaining the fluid balance in the body, wherein it collects excess fluid and other particulate matter from the tissues and deposits in the bloodstream. Another function of the lymphatic system is that it defends the body against infections with the disease-fighting cells called the lymphocytes.

What is Lymph?


(Source: Britannica)

In simple words, it is called the tissue fluid. It is a colourless fluid containing lymphocytes. Another name for it is interstitial fluid. It also carries nutrients, hormones etc.

Connection between the Circulatory system and Lymphatic system

Blood carries oxygen, nutrients etc. to the cells in the body. We all know that exchange of these nutrients and gases happens between the blood and the cells. This exchange always occurs in the lymph. The lymphatic system has an extensive network of vessels, which collects this fluid and ultimately drains it to the major veins. On its way, lymph gets filtered through lymphatic organs and lymph nodes. Tonsils, spleen, adenoids, thymus are all part of the lymphatic system.

Solved Questions For You

Q: Which is the largest lymphatic organ in the body? Write a few lines about it.

Ans: The spleen is the largest lymphatic organ, which is located on the left side of the human body. The spleen controls the number of red blood cells and it also helps fight infection. When the spleen detects dangerous bacteria or viruses in the blood, along with the lymph nodes, it creates white blood cells called as the lymphocytes which attack the microbes. The antibodies produced by lymphocytes kill the microbes, thus preventing the infection from spreading.

Q: State two major differences between blood and lymph.


Blood Lymph
It is a red coloured fluid that contains RBC, WBC, platelets, plasma, and proteins. It is a colourless fluid that does not have RBCs. It also has the plasma, WBCs, and platelets.
Blood transports nutrients and gases from one organ to the other. It maintains the fluid balance in the body. Lymph plays a role in the defence mechanism and the immune system of the body.


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