Which of the following is not a function of the lymphatic system?

Which of the following is not a function of the lymphatic system?

Which of the following is NOT a function of the lymphatic system?

All of the following are functions of the lymphatic system except for which answer choice?

Type 1 diabetes is a well-understood autoimmune disease. Autoimmune diseases result from an immune system-mediated attack on one’s own body tissues. In normal development, an organ called the thymus introduces immune cells to the body’s normal proteins. This process is called negative selection, as those immune cells that recognize normal proteins are deleted. If cells evade this process, those that recognize normal proteins enter into circulation, where they can attack body tissues. The thymus is also important for activating T-cells that recognize foreign proteins.

As the figure below shows, immune cells typically originate in the bone marrow. Some immune cells, called T-cells, then go to the thymus for negative selection. Those that survive negative selection, enter into general circulation to fight infection. Other cells, called B-cells, directly enter general circulation from the bone marrow. It is a breakdown in this carefully orchestrated process that leads to autoimmune disease, such as type 1 diabetes.

B-cells are primarily activated in lymph nodes, similar in some respects to T-cell activation in the thymus. Which of the following is true of the lymphatic system?

I. It drains excess fluid from interstitial spaces

II. It has one-way valves similar to those in veins

III. It is actively pumped by skeletal muscle contraction

Which of the following is not a purpose of the lymphatic system?