MCAT Biology Question 108: Answer and Explanation

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Question: 108

3. The lymphatic system:

  • A. transports hormones throughout the body.
  • B. transports chylomicrons to the circulatory system.
  • C. causes extravasation of fluid into tissues.
  • D. is the site of mast cell activation.

Correct Answer: B

Explanation:

The main function of the lymphatic system is to collect excess interstitial fluid and return it to the circulatory system, maintaining the balance of body fluids. However, this is not one of the answer choices. In addition, the lymphatic system accepts chylomicrons from the small intestine and delivers them to the cardiovascular circulation. Transport of hormones is a function of the cardiovascular system, eliminating choice (A). The lymphatic system absorbs fluid that has been pushed into tissues, but does not cause the extravasation of the fluid, eliminating choice (C). Mast cells reside in (and are activated in) the skin and mucous membranes, eliminating choice (D).

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