Digestion a. The mouth: salivary alpha enzyme chew food‚ perceive taste‚ moisten food with saliva‚ lubricate food with mucus‚ release starch –digesting (amylase) enzymes‚ initiate swallowing reflex - Enzyme: alpha amylase with cooked starch as substrate – starch digestion enzyme an enzyme that catalyses the breakdown of starch into sugar - The Functions of Saliva - 1. Moistens and lubricates food‚ permitting swallowing 2. Holds taste producing substances in solution and bring them in
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Human Digestion Shaunda SCI/241 05/16/14 Human Digestion From what I have learned from the weekly readings and watching the animated digestive tract. When humans digest food‚ we go through a complex process‚ in which the food eaten is turned into energy that is needed in order to survive. During the digestion process the food eaten becomes waste that has to be eliminated eventually. I will discuss how this process works in each area of mouth‚ stomach‚ small intestine
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The digestion process The digestion process begins in the mouth. First we take a bite of food. The presccence of food in the mouth stimulates the flow of saliva from the salivary glands. Saliva moistens the food and carries dissolved food molecules to the taste buds. Saliva helps digest food because it contains enzymes that start to break it down. After the food is covered with saliva‚ you then begin to chew your food. Chewing breaks down food into smaller pieces and also breaks apart fiber that
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Living Digestion The first step in the journey of a sandwich is the mouth‚ where mastication occurs. The salivary glands secrete saliva which includes enzyme amylase. The teeth masticate and reduce the food into smaller pieces. The tongue moves the food around and enables swallowing. While the food is being broken into smaller pieces‚ amylase breaks down the carbohydrates found in the bread. After chewing (or mastication) is done‚ the food moves down the esophagus through peristalsis. The epiglottis
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Digestion/ Absorption and Homeostasis In order to survive‚ our bodies must bring in energy and nutrients for the cells of the body through eating and digestion of food. To be carried to the cells of the body by the blood stream‚ food must be broken down to molecules. This breaking down of food into molecules‚ small enough to be absorbed into and carried through the blood stream‚ is carried out by the digestive system through the process of digestion and absorption. Digestion is the process of
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EXPERIMENT 13 DIGESTION IN THE SMALL INTESTINES ------------------------------------------------- ABSTRACT The small intestine serves as the site of major digestive and absorptive processes. In this experiment‚ the action of pancreatic enzymes on representative samples of each food group under different conditions‚ such as increased/decreased pH and presence of other substances‚ were observed. A pancreatin solution was first prepared from a hog pancreas and was completely neutralized using
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Defn. of Digestion: the process whereby a biological entity processes a substance‚ in order to chemically convert the substance into nutrients. It usually involves mechanical manipulation and chemical action. Mechanical Digestion What is it? This type of digestion involves the mixing‚ grinding or crushing of large pieces of food into smaller places. Why does it take place? So that the food we consume is broken down into smaller pieces before we swallow it which in turn makes process of
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| | | 2. Using the descriptions of the egg white that you wrote in the Student Guide‚ rank the test tubes in order of greatest amount of digestion to least amount of digestion. For each tube‚ explain why it would have exhibited that that level of digestion. Answer: |Tube with greatest amount of digestion: | |Test Tube 4
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fragments. This step is made possible by the contraction of the muscle of the stomach‚ the muscularis. Composed of three layers of fibers arranged longitudinally‚ circular and oblique‚ it mixes and kneads the food. Then begins the chemical digestion. Only the digestion of proteins begins in the stomach. The mucosa contains glands that secrete gastric juices. Under normal conditions‚ the production of juices is 2 to 3 L per day. Hydrochloric acid and enzymes are also produced by cells of the stomach. All
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DIGESTION IN THE MOUTH: Food is mechanically cut by incisors and canines‚ chewed by molars and premolars‚ and mixed with saliva by the tongue. The saliva has been produced by salivary glands‚ which pour it into the mouth through salivary ducts. This process of introducing food into the mouth is called ingestion. Chewing breaks food into smaller particles so that chemical digestion can occur faster. This cutting and mixing is called mastication. Moreover‚ food is chemically digested by salivary
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