Digestion is the process of breaking down chemicals from food into forms that the body can use!
The process of digestion begins in your mouth. When you chew and break up your food with your teeth, this is known as physical digestion. Chemical digestion is the process of chemically breaking down the food/nutrients with enzymes, which is a chemical that speeds up the process of digestion. Enzymes in the saliva (which is produced by the salivary glands) break down the carbohydrates in the food into sugars. The saliva also moistens and softens the food which makes it easier to swallow. The tongue moves the food around and rolls it up into a soft ball that's swallowed and then travelling down a muscular tube called the esophagus.
The esophagus transports food to your stomach through a process called peristalsis.
The stomach is muscular pouch that stretches when full and folds up when empty. Glands in the stomach release hydrochloric acid that kills many harmful organisms in the food and also begin breaking down proteins. Some other glands make and release enzymes that also help digest the proteins. The walls of the stomach contract and relax to mix the food with the enzymes. The stomach lining is covered with mucus, so the hydrochloric acid doesn't eat up your stomach. After your stomach is finished digesting after several hours, it becomes a pasty-mixture called chyme. The stomach squeezes a bit of the mixture into a long tube called the small intestine.
The small intestine has glands in the walls of it that continue the breakdown of carbohydrates and proteins. A different organ, the pancreas, releases enzymes into the small intestine that help speed up the process. The liver makes bile (a fluid that breaks fats into small droplets) which can be digested. The gall bladder is practically a storage unit for the bile. When digestion is completed in the small intestine, the food materials are in thin, liquid forms that can be absorbed through the bloodstream.
Food that is not absorbed through the small intestine goes into a wide tube called the large intestine that contains bacteria. The bacteria breaks down plant fibers into glucose. Vitamins, minerals, and water from digestive fluids are absorbed by blood vessels in the large intestines' walls.
The remaining, unabsorbed materials are in the form of solid waste, and then the large intestine passes the wastes out of the body through the anus.
Primary Organs (Food goes through these): Mouth, esophagus, stomach, small intestine, large intestine, and anus.
Accessory Organs (Food doesn't go through these): Salivary glands, liver, gall bladder, and pancreas.