How lymph enters?

Lymph enters the lymphatic capillaries at the interstitial spaces between cells and tissues. The capillaries are thin-walled vessels that are permeable to proteins and other large molecules. As blood circulates through the capillaries, fluid and solutes are exchanged between the blood and the interstitial spaces. The fluid that enters the interstitial spaces is called interstitial fluid.

Interstitial fluid contains waste products from cells, as well as proteins and other large molecules. The lymphatic capillaries collect the interstitial fluid and carry it to the lymph nodes. The lymph nodes are small, bean-shaped organs that filter the lymph and remove any harmful substances.

Once the lymph has been filtered, it is returned to the bloodstream via the thoracic duct. The thoracic duct is a large lymphatic vessel that runs from the abdomen to the neck. It empties into the left subclavian vein, which is a large vein that carries blood from the head and arms to the heart.

The lymphatic system is an important part of the immune system. It helps to protect the body from infection by removing waste products and harmful substances from the tissues.