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Describe the Lymphatic System and It's Relationship with the Blood System

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Describe the Lymphatic system and it’s interdependence with the blood system

The lymphatic system is a secondary circulatory system made up of a network of vessels which transport a fluid called lymph through a series of filtering stations called nodes. Before it returns to the veinous system
It has a population of white blood cells in the nodes that deals with bacteria in a number of ways. The principle function is to patrol and protect the body from infection. The lymphatic system also picks up most of the fats from the digestive system and returns them to various organs. It also transports excess interstitial fluid.
The system starts with the capillaries which are blind ended are more permeable than blood capillaries. The lymph then moves into larger lymph vessels where lymph nodes are located. In these nodes the lymph is processed by T and B lymphocytes and phagocytes.
The pressure of the lymphatic system is lower than the blood system so the lower limbs use valves and the skeletal muscles as a pump. The lymphatic system consists of nodes a. Popliteal, behind the knew b. Inguinal, in the groin c. Supratrochlear at the elbows d. Cervical, in the neck
It also includes the main duct, a short duct and the cysterna chyli. Tissues outside of the vessel network include the spleen, thymus, tonsils, appendix and Peyers patches.
The spleen is located behind the stomach tucked into the bottom of the thoracic cage on the left of the body. It is an organ made up of blood channels lined with T and B cells and phagocytes. Blood cells are broken down in the spleen, haemoglobin is recycled and pigment and bilirubin is then used to make up bile.
The Thymus matures T cells and the tonsils tackle airborne bacteria. Peyers patches and the appendix deal with food borne bacteria.
Both the lymphatic and blood system are circulatory in nature with the lymphatic system being secondary. The lymphatic system collects excess interstitial fluid which is released from the blood system. The vessels of both systems are similar although there is less pressure in the lymphatic system. The heart receives lymph back after it has been gathered round the body and thus it is used to maintain even blood pressure.

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