It is possible for them not to inject venom every time they bite. So, the next time you see one, admire the snake from a distance only, and leave the snake alone. People have slimy skin, not snakes. Although myths represent snakes as slimy, they have very dry skin. Their scales aid in locomotion and prevent the snake from drying out.
Snakes have backbones, just like people.
Their skeletal structure is composed of hundreds of vertebrae, with a pair of ribs to go along with each. Although they appear to move quickly, they are probably going no faster than 5 miles per hour, depending on the species. Because snakes are cold-blooded, they have to rely on their surroundings to control their body temperatures. Their cold-blooded nature is the reason that a large number of snake species are found near the equator and smaller numbers of species are found as you near the north or south poles. Snakes shed their outer layer of skin several times a year.