CanFitPro Personal Training Specialist Test 2026 – 400 Free Practice Questions to Pass the Exam

Motor neurons are specialized nerve cells that carry information from the central nervous system (CNS) to muscles in the body, allowing for voluntary movements. Option A is incorrect because the role of carrying nutrients throughout the body falls to the circulatory and digestive systems, not motor neurons. Option C is incorrect because the kidneys and liver are responsible for filtering waste from the blood. Option D is incorrect because sensory neurons are responsible for transmitting sensory information to the brain. Therefore, the only correct answer is B as motor neurons play a critical role in muscle movement and control.