Critical Care Registered Nurse (CCRN) Practice Exam

In which body system do metastatic tumors primarily operate?

1. Endocrine system

2. Central nervous system

3. Respiratory system

4. Cardiovascular system

The correct answer is: Central nervous system

Metastatic tumors primarily operate within the central nervous system because cancer cells can spread from their original site to the brain and spinal cord through the bloodstream or lymphatic system. This type of metastasis is particularly significant as it can lead to severe neurological symptoms and complications, affecting cognitive function, motor skills, and overall health. The central nervous system is a critical area of concern for metastatic disease due to its unique environment and the potential for tumors to disrupt essential functions. While metastatic tumors can theoretically affect any body system, they are most commonly documented as spreading to the brain, making this option notably correct in the context of the question. Other systems may be involved depending on the origin of the cancer and its progression, but the central nervous system is a primary site for many metastatic cancers, illustrating the particular importance of monitoring and treating such occurrences in critically ill patients.