ANATOMY

Detailed explanation-1: -Food leaves the mouth when the tongue and pharyngeal muscles propel it into the esophagus. This act of swallowing, the last voluntary act until defecation, is an example of propulsion, which refers to the movement of food through the digestive tract.

Detailed explanation-2: -The last phase is the intestinal phase. As protein digestion occurs in the intestine, signals are sent via molecules to the stomach to produce more acid. Once the acid is secreted, it activates pepsin, which initiates protein digestion.

Detailed explanation-3: -The digestive processes are ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation.

Detailed explanation-4: -The first step in the digestive process occurs in the mouth. This is where food is chewed and broken down into a size that can be safely swallowed. The start of swallowing food or liquid is voluntary. But once it begins, the process becomes involuntary and continues under the control of the nerves.

Detailed explanation-5: -Eat food. Break down the food into tiny pieces. Absorb nutrition into the body: move the small particles out of the digestive system and the rest of the body. Get rid of the waste, which is anything your body can’t use.