digestive process - released slowly from the stomach, under...

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The Digestive Process Once the food is put into the mouth, the digestive process has begun. The teeth mechanically break the food into smaller pieces and the food is then mixed with saliva produced by salivary glands. Saliva serves to moisten and lubricate food, making it easier to swallow, and it also contains enzymes that begins digestion of carbohydrates, although, the enzymatic action of saliva is negligible. We then swallow the food, to move it through the esophagus, which is now called a bolus, it goes into the oropharynx, past the opening to the larynx, which is closed, as part of the swallowing reflex, by a flap-like structure called the epiglottis, and into the 25 cm long esophagus. The esophagus is a muscular tube, which undergoes peristalsis which pushes the bolus into the stomach. The stomach is a “J” shaped, hollow, muscular organ that serves to store food temporarily and serve as the place where chemical digestion (mainly of proteins) begins. The food is mixed with water secreted by the stomach to create a watery mixture called chyme. The chyme is
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Unformatted text preview: released slowly from the stomach, under the control of hormones, into the 6 m long small intestines for further digestion. During the process of absorption, nutrients that come from the food (including carbohydrates, proteins, fats, vitamins, and minerals) pass through channels in the intestinal wall and into the bloodstream. The blood works to distribute these nutrients to the rest of the body. The waste parts of food that the body can't use are passed out of the body as feces. Every morsel of food we eat has to be broken down into nutrients that can be absorbed by the body, which is why it takes hours to fully digest food. In humans, protein must be broken down into amino acids, starches into simple sugars, and fats into fatty acids and glycerol. The water in our food and drink is also absorbed into the bloodstream to provide the body with the fluid it needs. References: Kidshealth.org/digestivehealth http://www.innerbody.com/image/digeov.html mayoclinic.com The Digestive Process...
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This note was uploaded on 11/02/2011 for the course BUS SCI/241 taught by Professor Unknown during the Spring '11 term at University of Phoenix.

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digestive process - released slowly from the stomach, under...

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