The mucus is produced by glands in the foot of the snail. These glands secrete a mixture of proteins, carbohydrates, and water. The proteins and carbohydrates form a gel-like substance that traps water molecules. This gel provides the slimy texture of the mucus.
The snail spreads the mucus over the surface it is crawling on by moving its foot in a wave-like motion. This motion helps to distribute the mucus evenly and create a smooth surface for the snail to move on.
The production of mucus is essential for the snail's ability to move. Without mucus, the snail would not be able to crawl efficiently or protect its foot from damage.