what type of digestion includes mixing of food in the mouth, churing of food in the stomach ?

Answer 1

Digestion is the biochemical breakdown of food into constituents units with the help of hydrdolytic(digestive) enzymes.While chewing, the taste buds send stimulation and the outcome is the secretion of saliva by the parotid, submaxillary and sublingual glands. Saliva contains ptyalin which breaks down polysaccharides into disaccharides.Mucus of the saliva helps degglution( swallowing). In the stomach, gastric glands secrete propepsin which works in the acidic medium. It breaks proteins into dipeptides or peptides.So, in the mouth there is a partial carbohydrate digestion and in the stomach there is a partial protein digestion. Mastication and churning are mechanical processes.

Answer 2

In humans, digestion begins in the oral cavity where food is chewed (mastication) with the teeth. The process stimulates exocrine glands in the mouth to release digestive enzymes such as salivary amylase, which aid in the breakdown of carbohydrates. Chewing (mechanical catabolism) also causes the release of saliva, which helps condense food into a bolus that can be easily passed through the esophagus. The esophagus is about 20 centimeters long. Saliva also begins the process of chemical catabolism, hydrolysis. Once food is chewed properly, the food is swallowed. The bolus is pushed down by the movement called peristalsis, which is an involuntary wave-like contraction of smooth muscle tissue, characteristic of the digestive system. The mechanism for swallowing is co-ordinated by the swallowing centre in the medulla oblongata and pons. The reflex is initiated by touch receptors in the pharynx as a bolus of food is pushed to the back of the mouth by the tongue. The uvula is a small flap that hangs from the roof of the mouth. During swallowing it and the soft palate retract upward and to the rear to close the nasopharynx, which prevents the food from entering the nasal passages by triggering closure of the soft palate. When swallowed, the food enters the pharynx, which makes special adaptations to prevent choking or aspiration when food is swallowed. The epiglottis is a cartilage structure that closes temporarily during swallowing, preventing food and liquids from entering the trachea.

The food enters the stomach upon passage through the cardiac sphincter, also known as the esophageal sphincter. In the stomach, food is further broken apart through a process of heuristic churning and is thoroughly mixed with a digestive fluid, composed chiefly of hydrochloric acid, and other digestive enzymes to further denature proteins. The parietal cells of the stomach also secrete a compound, intrinsic factor which is essential in the absorption of vitamin B-12. As the acidic level changes in the small intestines, more enzymes are activated to split apart the molecular structure of the various nutrients so they may be absorbed into the circulatory or lymphatic systems. Absorption is when smaller molecules, such as glucose or alcohol, pass through the membrane of the stomach directly into the blood stream.

Answer 3

Mechanical digestion, as opposed to chemical digestion.
Mechanical digestion is breaking the food into little pieces of food, by chewing for example.
Chemical digestion is breaking down the food into nutrients by the action of enzymes, like sugar becoming glucose.

Answer 4

It's mechanical digestion (not chemical).

Answer 5

yep, it's mechanical digestion.

Answer 6

mechanical