The lymphatic system is closely associated with the blood system and represents an accessory route by which lymph fluid can flow from the body’s tissues back into the blood stream. Lymph vessels can be categorized into lymph capillaries, precollectors, lymph collectors and lymphatic trunks. Lymph capillaries represent the beginning of the lymphatic drainage system and originate in close proximity to blood capillaries. Lymph capillaries resemble blood capillaries but have a more irregular cell structure, and their walls are more permeable than those of blood capillaries. Because of their unique structure, lymph capillaries are able to absorb larger particles from the tissues, such as proteins, cells, bacteria and other large substances, which cannot be absorbed by blood capillaries. These particles, together with water then travel through an intricate network of precollectors and larger lymph ...view middle of the document...
The part of the circulatory system that delivers blood to and from the lungs is known as the pulmonary circulation, and the flow of blood throughout the rest of the body is administered by the systemic circulation.
The lymphatic system and its vessels do not form a closed circulatory system. It begins with small lymphatic vessels (lymph capillaries) in the body tissues, and continues with successively larger lymphatic vessels (collectors and trunks), which ultimately connect to the venous part of the blood circulatory system. There is no central pump, lymph vessels produce their own propulsion system with a network of smooth musculature located in the walls of lymph collectors and trunks. Since the lymph vessels work according to the one-way principle and not as a closed circulatory system, it is more appropriate to speak of lymph transport rather than lymph circulation. While the flow of blood through the blood vessels is uninterrupted, the transport of lymph fluid through the lymph vessel system is interrupted by lymph nodes.
The lymphatic system is associated with the circulatory system so lymph fluid from tissues can flow back into the blood stream. Both the circulatory and lymphatic system is composed of vessel networks that transport material. The circulatory system transports, oxygen, carbon dioxide, and nutrients, while the lymphatic system transports lymphatic fluid. Lymph capillaries originate and resemble blood capillaries but with a different cell form and are more permeable than blood capillaries. Lymph capillaries can absorb larger particles than blood capillaries. Water and particles travel through precollectors and larger collectors and trunks back into the circulatory system. On the way back to the circulatory system lymph is filtered at lymph nodes. The lymphatic system is closed as is the circulatory system, and there is no pump as in the blood network from the heart. Lymph as its own propulsion and is interrupted by lymph nodes whereas blood flow is not.