National Academy of Sports Medicine (NASM) Certified Personal Trainer (CPT) Practice Exam

What do afferent neurons primarily do?

1. Transmit motor signals to muscles

2. Send sensory information to the brain

3. Process information internally within the nervous system

4. Regulate involuntary bodily functions

The correct answer is: Send sensory information to the brain

Afferent neurons are crucial components of the sensory nervous system, and their primary function is to transmit sensory information from sensory receptors throughout the body to the central nervous system, particularly to the brain. This information can include stimuli related to touch, pain, temperature, and proprioception, allowing the brain to interpret various conditions and respond appropriately. By sending this sensory data, afferent neurons facilitate the perception of the environment and the body's internal state, making them essential for functions like reflexes and voluntary movements that require sensory feedback. The ability to relay this information is vital for maintaining homeostasis and guiding actions based on sensory experiences.