Both get started at about the same time. As the teeth are grinding up the food, enzymes in the saliva are breaking down starch.
does absorption occur when mechanical or chemical digestion
does absorption occur when mechanical or chemical digestion
The small intestine completes the process of chemical digestion.
think so
no in the mouth
Mechanical Digestion happens in the mouth where your food is physically broken down. Chemical digestion happens in your intestines, where enzymes break down and absorb nutirients
It needs to be smooshed before the stomach acid can break it down. So that it is easier to break down chemically. You wouldn't ride your bike before you learned how to would you? Probably not. It works the same way for the body.
no
The pharynx is not directly involved in digestion. It is a part of the digestive and respiratory systems, serving as a passageway for food and air to travel through. The process of digestion involves mechanical and chemical actions that occur in organs like the mouth, stomach, and intestines.
Mechanical digestion, i.e. your body breaking up the food into smaller pieces, is largely meant to speed chemical digestion up. We know that the rate at which the chemical reaction takes place is dependent on four things: the physical state of the reactants involved in the reaction, the temperature at which the reaction takes place, the concentration of the reactants, and the presence of a catalyst. Each influences the rate of reaction in different ways. Mechanical digestion breaks the food into smaller pieces, i.e. changes the physical state. With the larger pieces broken into smaller ones, more surface area is exposed. With greater surface area exposure, chemical digestion can take place much more rapidly. However, if for some reason you could get just huge chunks of food down your throat without chewing it, your stomach still churns (mechanical digestion) and the contractions in your intestines also help to break up food. So technically yes, chemical digestion would take place, but at a much slower and inefficient manner.
Biting a sandwich involves mechanical digestion, as it breaks the food into smaller pieces through the action of teeth. This process increases the surface area of the food, making it easier for enzymes to later facilitate chemical digestion in the stomach and intestines. Chemical digestion would occur when enzymes begin to break down the food's components, such as carbohydrates and proteins.
Stomach and Mouth