Lymph collect extra tissue fluid and material which cannot directly enter the blood. Is it true or false
The Correct Answer and Explanation is:
True.
Lymph is a fluid that is collected from the tissues by the lymphatic system. It consists of extra tissue fluid, also known as interstitial fluid, which leaks out of blood capillaries into the surrounding tissues. This fluid contains water, nutrients, waste products, and proteins, and its main role is to maintain the fluid balance within the body.
After the tissue fluid is collected, it enters the lymphatic vessels. As it moves through these vessels, lymph is filtered by lymph nodes, where it is exposed to white blood cells that help to fight infections and remove any harmful microorganisms or foreign particles. The lymph then returns to the bloodstream through the thoracic duct and the right lymphatic duct, where it is eventually added to the circulatory system, specifically at the junction of the subclavian veins.
The lymphatic system serves as a secondary circulatory system that helps to collect and return excess fluid from tissues. This is important because not all of the fluid from the blood is reabsorbed by the capillaries after the exchange of gases, nutrients, and waste. Some of it remains in the tissues, and without the lymphatic system, this excess fluid would accumulate, leading to swelling (edema). Additionally, lymph carries material that cannot directly enter the blood, such as larger molecules, fat-soluble vitamins, and some proteins.
Thus, the lymphatic system is essential for immune defense, tissue fluid balance, and the absorption of fats from the digestive system.
