The lymphatic system is composed of all of the following exc

The lymphatic system is composed of all of the following except lymphatic vessels lymph nodes the spleen. the vena cava lymph. The lymphocytes are most important in helping maintain normal blood volume. transporting gases to and away from lymph nodes eliminating variations in the composition of interstitial field transporting lipids from the digestive tract fighting infection Compared to blood capillaries. lymph capillaries exhibit all of the following except that they have no basement membrane are larger in diameter. have walls of endothelial cells that overlap like shingles are smaller in diameter. are frequently irregular in shape Lymphatic vessels are located in almost all portions of the body except the CNS. periphery. renal arteries. groin. throat Most of the lymph returns to the venous circulation by way of the right lymphatic duct. thoracic duct cisterna chitin. hepatic portal vein. Dural sinus.

Solution

19. D. Lymphatic system is composed of all of the following except the vena cavae.

Vena cavae are the structures into which one of the two lymphatic ducts empty its contents. So, it is not part of the lymphatic system.

20. E. The lymphocytes are most important in fighting infection. Lymphocytes are of two types B and T cells. Both are part of the immune system and help in producing antibodies that fight the antigen.

21. A, B, C, D. Compared to blood capillaries, lymph capillaries exhibit all of the following except that they have no basement membrane, have walls of endothelial cells that overlap like shingles, and are smaller in diameter.

22. A. Lymphatic vessels are located in almost all portions of the body except the central nervous system. Lymphatic vessels are present all over the body except in the bone marrow and central nervous system.

23. A, B. Most of the lymph returns to the venous circulation by way of the right lymphatic duct and thoracic duct. There are two ducts by which lymphatic vessels empty the contents. They empty the contents into right and left subclavain veins respectively.