The digestive system contains mostly smooth muscle cells. This is because it would be difficult if you had to control every single action in digestion. Smooth muscle cells are in the esophagus, stomach, the small intestine, the large intestine, and four of the five sphincters. Smooth muscles are long and have an incline to the middle, and then a decline out from it. They look like bent boomerangs. When one of them contracts, it pulls on others attached to it, and activates those smooth muscles. Then the next ones get pulled on, and activate. And so on and so forth. The original muscle cell then relaxes. Then the second wave of muscles relaxes. This creates a wave movement, which allows you to swallow your food and move it through the intestines. The smooth muscle in your stomach is slightly different in use than the smooth muscle in your throat. It still contracts in waves, but the stomach is too big, so it just churns up the acid-food-bile combination that is in your stomach. The final sphincter is made of skeletal muscle, so that we can choose when we release our feces into the outside world. Another skeletal muscle in the digestive system is the tongue. If you want to move your tongue to the left, you can. This helps you move food around your mouth.
The digestive system contains mostly smooth muscle cells. This is because it would be difficult if you had to control every single action in digestion. Smooth muscle cells are in the esophagus, stomach, the small intestine, the large intestine, and four of the five sphincters. Smooth muscles are long and have an incline to the middle, and then a decline out from it. They look like bent boomerangs. When one of them contracts, it pulls on others attached to it, and activates those smooth muscles. Then the next ones get pulled on, and activate. And so on and so forth. The original muscle cell then relaxes. Then the second wave of muscles relaxes. This creates a wave movement, which allows you to swallow your food and move it through the intestines. The smooth muscle in your stomach is slightly different in use than the smooth muscle in your throat. It still contracts in waves, but the stomach is too big, so it just churns up the acid-food-bile combination that is in your stomach. The final sphincter is made of skeletal muscle, so that we can choose when we release our feces into the outside world. Another skeletal muscle in the digestive system is the tongue. If you want to move your tongue to the left, you can. This helps you move food around your mouth.