Functions of the Digestive System
The digestive system performs a crucial set of functions that are important for our survival, including:
Ingestion is known as the act of placing food in the mouth.
The food undergoes mechanical digestion through chewing (mastication) which breaks down food into smaller, more manageable pieces, increasing its surface area for further processing.
Chemical digestion is the breakdown of complex molecules (such as carbohydrates, proteins, and lipids) into less complex ones that can be absorbed easily by making use of enzymes, acids, and other chemicals.
The salivary glands, stomach, pancreas, and liver, secrete digestive enzymes, acids, and other substances that aid in the breakdown of food and neutralization of stomach acid.
After being digested, nutrients are absorbed through the wall of the small intestine and delivered to the bloodstream.
Formation of Feces & Elimination
In the large intestine, the colon consolidates and compacts the waste material into feces which then gets stored in the rectum until finally getting expelled through the anus.