Which type of nerve fibers react to heat, cold, touch, pressure, and pain?

Sensory nerve fibers are specialized to react to various stimuli, including heat, cold, touch, pressure, and pain. These fibers play a crucial role in the sensory system by transmitting information from sensory receptors in the skin and other tissues to the central nervous system for processing. This allows the body to perceive and respond to different environmental factors effectively.

Motor nerve fibers, in contrast, are responsible for transmitting signals from the brain and spinal cord to muscles, enabling movement. Sensorimotor nerve fibers, which are often considered in the context of both sensory and motor functions, do not specifically react to the stimuli listed. Secretory nerve fibers, on the other hand, are involved in regulating the release of substances, like sweat or oil, rather than sensory perception. Thus, sensory nerve fibers are the correct answer as they directly relate to the sensations experienced from the various stimuli mentioned.