MTEL Biology Practice Exam

Category - Biology

Which of the following best describes an important role of the lymphatic system in circulation?
  1. Returning fluid and blood proteins lost by capillaries back to the veins.
  2. Transporting carbon dioxide released from cells to the bloodstream.
  3. Maintaining electrolyte balance of body fluids within tolerance limits.
  4. Removing toxins from the blood before they damage the heart.
Explanation
Correct Response: A. As blood circulates through the capillaries, it loses a significant volume of fluid to the surrounding tissues. Vessels of the lymph system collect the lost fluid and return it to the blood stream. Without this important function of the lymphatic system, blood volume would most likely drop to the extent that circulation could no longer occur. Carbon dioxide released from cells (B) diffuses through the interstitial fluid that bathes the cells and enters the capillaries, also by diffusion. The kidneys, not the lymphatic system, are the primary organs that maintain the electrolyte balance of body fluids (C). The liver, not the lymphatic system, has a number of functions that include the detoxification of potentially harmful chemicals from the bloodstream (D).
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