Digestion refers to the chemical and mechanical processes that break down food.
What is digestion?
Digestion is the process through which food moves through our bodies, with the goal of giving energy to the body or constructing new cellular components and tissues, such as muscle and fat.
How does digestion take place?
- When food enters the mouth, it is mechanically digested (chewing) and becomes when it comes into touch with saliva. Saliva contains salivary amylase, which helps food digest starch. Salivary amylase is a digestive enzyme that starts the digestion of starch in meals.
- The food will be in the form of a small, round slurry mass known as a bolus after mastication and starch digestion.It moves down the esophagus and into the stomach due to peristalsis.
- In the stomach, gastric fluids begin protein digestion. Pepsin and hydrochloric acid are the main components of these juices. Because the HCl may harm the stomach wall, the stomach secretes mucus, which forms a sticky covering that protects the stomach from the acid's harmful effects.
- Peristalsis, a mechanical mixing process that permits the mass of food to interact with the digestive enzymes, occurs concurrently with protein digestion.
- After some time, a thick liquid called chyme is produced, which enters the duodenum and mixes with pancreatic digestive enzymes and liver bile juice before passing through the small intestine. After the chyme has been entirely digested, it is taken into the bloodstream, where it forms a sticky barrier that protects the body from the acid's harmful effects.
Thus, we can conclude that option A is correct.
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