Because the food is hard. xD
No it's made by idiots like you!
Digestive organs
The muscle responsible for moving food through the digestive system is the smooth muscle found in the walls of the gastrointestinal tract. The heart is primarily made up of cardiac muscle which is responsible for pumping blood throughout the body.
smooth muscle is another involuntary muscle you cannot control, it is found in the walls of the internal organs and blood vessels, made up of sheets of cells that are ideally shape to form organs such as digestive tract and reproductive tract and they make up internal organs, smooth muscles are generally spherical, it is also contract slowly and can remain contracted for a long period of time without hiring, they have one nucleus.
Muscles are made up of "excitable cells" which can contract. Visceral muscle is smooth muscle--one of three types of muscles in the body. Visceral muscle is found in the body in places like the arteries, bladder, the digestive tract and many other muscles which need to contract in order to perform their job.
digestive system is made up of sqamous cell epithelium ,serous layer, circular and longitudnal smooth muscle,submucous layer,mucous layer.
The muscular layer responsible for peristalsis in the alimentary canal is the muscularis externa. It is composed of smooth muscle fibers arranged in circular and longitudinal layers that contract and relax to push food along the digestive tract through coordinated movements known as peristalsis.
Its a type of smooth muscle that is made up of fibers bounded together to form a single unit.It is found in walls of hollow organs(digestive tract, urinary tract, hollow vessels and reproductive system.In some cases they are self- excitable.They spontaneously generate graded oscillation in their membrane potential that is rhythmical in nature called slow wave potential or pace maker activity.
There is a bilayer of muscles in the intestines called the muscularis externa. There is an inner circular layer and outer longitudinal layer. These two layers are responsible for the slow regular propulsion of food called peristalsis.
The muscular layer, known as the muscularis externa, contracts to facilitate the movement of materials through the alimentary canal. This layer is made up of smooth muscle that helps propel food and waste products through the digestive system via peristalsis.
Much of our internal organs is made up of smooth muscles. Smooth muscles make up the walls of many organs; eg bladder, gallbladder, arteries, and veins, digestive tract and oesophagus. The smooth muscles are controlled by hormones and the nervous system. Smooth muscles are often called involuntary muscles because we cannot control there movement.
Involuntary smooth muscle