The human digestive system begins in the mouth and ends at the anus. Enzymes in saliva break food down into smaller particles in the mouth. Food is then swallowed and goes through the digestive tract before leaving the bottom through the rectum and anus.
The digestive system helps the body break down food, so nutrients can be used for cell repair, growth and energy. The digestive system is also responsible for storing and excreting solid wastes.
According to Branch Basics, digestion begins in the mouth when the process of chewing starts. Salivary glands will secrete a mucus, which assists in lubricating the food before swallowing.
Chemical digestion is the process by which food is broken down and has most of its nutrients extracted. It is distinct from mechanical digestion, which is the physical breakdown of food as it is chewed.
The amount of time that digestion takes varies from person to person, but on average it takes around 33 to 50 hours. It takes 6 to 8 hours for food to pass through the stomach.
The primary purpose of bile in the digestive process is to facilitate the digestion and dispersion of consumed fats. According to the Encyclopedia Britannica, this takes place in the lumen of the small intestine.
Digestion is the process by which the body obtains nutrients from the environment, notes Wikipedia. Without these nutrients, a living body would gradually run out of the energy necessary to maintain health. Eventually, a body that can no longer digest food starves to de...