Final answer:
Mechanoreceptors are the class of receptors that respond to touch and internal movement, with tactile receptors like Merkel's disks being key for light touch and texture.
Step-by-step explanation:
The class of receptors that respond to touch and internal movement are called mechanoreceptors. Mechanoreceptors are sensory receptors that transduce mechanical disturbance such as touch, pressure, motion, and sound. They can be categorized into different types, including tactile receptors, proprioceptors, and baroreceptors. The tactile receptors, which are responsible for sensing touch, include Merkel's disks, Meissner's corpuscles, Ruffini endings, and Pacinian corpuscles.
Merkel's disks are particularly important for determining light touch and texture, making them critical for tasks that require fine motor skills, such as typing on a keyboard.