Emergency Medical Technician (EMT) Intermediate Practice Exam

In what way does the lymphatic system help maintain homeostasis?

1. Absorbing nutrients from the digestive system

2. Regulating calcium levels

3. Returning excess fluid to circulation

4. Transporting oxygen to cells

The correct answer is: Returning excess fluid to circulation

The lymphatic system plays a crucial role in maintaining homeostasis by returning excess fluid to circulation. This system collects excess interstitial fluid, which is the fluid that surrounds cells, and prevents the accumulation of fluid in tissues, a condition known as edema. By draining this excess fluid and returning it to the bloodstream, the lymphatic system helps maintain the appropriate balance of fluids in the body, which is essential for all physiological processes. This fluid balance supports the immune system and helps in the transport of nutrients, waste, and immune cells throughout the body, thereby contributing to overall homeostasis. Other functions like absorbing nutrients or regulating calcium levels are performed by other systems, such as the digestive system and endocrine system, respectively. While the lymphatic system does aid in transporting immune cells and certain absorbed nutrients like fats via lacteals, its primary and vital contribution to homeostasis centers on the regulation of fluid balance through the return of excess fluid to circulation.