The diagram illustrates sensory receptors in the skin. What structure does "D" represent?
A) Meissner corpuscles
B) Free nerve endings
C) Ruffini end organ
D) Pacinian corpuscle
E) Merkel disks

Sensory Receptors

Specialized cells or structures that detect external or internal environment stimuli and convert them into electrical impulses.

Pacinian Corpuscle

A type of nerve ending in the skin that detects pressure and vibration.

Free Nerve Endings

Sensory nerve fibers that extend into the tissues and open on the surface or just below, responsible for sensing pain, temperature, and touch.