Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

What type of sensation is primarily detected by free nerve endings?

1. Temperature

2. Pain

3. Pressure

4. Touch

The correct answer is: Pain

Free nerve endings are specialized sensory receptors located throughout the body, particularly in the skin and mucous membranes. They are responsible for detecting various types of sensations, but they are especially adept at sensing pain. This type of sensation, known as nociception, is communicated to the brain when tissue damage or potential damage occurs, enabling the body to react appropriately. While free nerve endings can also respond to temperature fluctuations, the primary and more recognized role of these nerve endings is in pain perception. They can be activated by potentially harmful stimuli, leading to the sensation of sharp, acute pain, or discomfort. This vital function helps to protect the body from injury and promotes avoidance behavior in response to pain-inducing stimuli. The other options, although they may involve other types of sensory receptors, are not the primary role of free nerve endings. For instance, pressure and touch are primarily detected by specialized mechanoreceptors, which respond differently to mechanical forces.