Final answer:
Merkel's disks and Meissner's corpuscles are mechanoreceptors involved in the sensation required for writing on paper, with Merkel's disks responding to light touch and Meissner's corpuscles contributing to the sensation of fine touch.
Step-by-step explanation:
In order to write on a piece of paper, the mechanoreceptors used are Merkel's disks, Meissner's corpuscles, Pacinian corpuscles, and Ruffini endings. Each of these mechanoreceptors has a different function related to touch and pressure sensation. Merkel's disks are slow-adapting, unencapsulated nerve endings that respond to light touch and are found in the upper layers of the skin. They are particularly abundant on the fingertips and lips and have small, well-defined receptive fields, making them highly sensitive to edges and fine details. Meissner's corpuscles also contribute to the sensation of fine touch and are found in more upper parts of the skin, particularly in glabrous skin, which is hairless skin such as that on the palms and fingers.