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Lymphatic System/Immune System

1. List the anatomical components of the lymphatic system.

2. How do lymphatic vessels originate?

3. Even though the lymphatic system is a component of the circulatory system, why is the term circulation not the most appropriate term to describe the flow of lymph?

4. Identify the body's first line of defense.

5. Activated B cells develop into clones of what two kinds of cells?

Solution Preview

1. List the anatomical components of the lymphatic system.
There are lymphatic capillaries, lymphatic vessels, lymph hodes, lymph trunks, lymph ducts, red bone marrow, thymus gland, spleen, and lymphatic nodules.

2. How do lymphatic vessels originate?
Lymphatic vessels begin as closed-ended vessels called lymphatic capillaries that exist in spaces between cells. Lymphatic capillaries have a diameter that is slightly larger than that of blood capillaries. They also have a unique structure that allows for the interstitial fluid to flow into them without flowing out of them. How does it do that? Well, the ends of the endothelial cells that make up the walls of the lymphatic capillaries overlap somewhat. When the pressure is greater in the interstitial fluid, the cells separate somewhat (kind of like opening a one-way valve) and the fluid flows inside. When the pressure is higher inside the capillary, ...

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