The contents of the sandwich are then mixed with saliva to moisten it and to make it easier to swallow. The sandwich is formed into a bolus and the tongue pushes the bolus to the back of the throat and then it is swallowed. The saliva contains an enzyme called amylase which breaks down starch (the bread) into sugars. The sandwich passes down the oesophagus and after 3-6 seconds of leaving the mouth, the food will reach the stomach by the involuntary wave like muscular contractions, known as peristalsis. The epiglottis stops any of the sandwich entering the windpipe by covering the windpipe hole.
Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use. * Esophagus Located in your throat near your trachea .and it is a long tube that runs from the mouth to the stomach It uses rhythmic, wave-like muscle movements (called peristalsis) to force food from the throat into the stomach. This muscle movement gives us the ability to eat or drink even when we're upside-down. * Stomach The stomach is a hollow organ, or "container," that holds food while it is being mixed with enzymes that continue the process of breaking down food into a usable form. Cells in the lining of the
Identify factors that affect the amount of time it takes for food to travel through the digestive tract - Explain how digestion occurs in mouth, stomach, small intestine, large intestine – The body starts the digestion process before food even enters the mouth. As soon as something that smells good hits the nose, the body starts to salivate and produce stomach acids. Once it enters the mouth, the body gets to work. All three salivary glands (the parotid, sublingual and submandibular) produce saliva which begins to chemically break down the food. The tongue and teeth move the food around, mixing it with the saliva, with all 32 teeth tearing and crushing it to break it down further into a softer composition called a bolus.
Liver – Major role in dealing with the nutrient products of food digestion. Detoxifies harmful substances in the intestines. Involved in recycling red blood cells by breaking them down. By product is bile, which is important in the breakdown of fats. Produces essential proteins and clotting factors for the blood and regulates metabolism and cholesterol.
Support the absorption of carbohydrates and proteins B. accept chyme from the stomach and complete digestion C. Absorbs B12,bile salts, fluids and electrolytes and secretes enzyemes that further break down carbohydrates and proteins 14. Slow the passage of food along the intestines and increase surface for absorption 15. A. Absorbs B12,bile salts, fluids and electrolytes and secretes enzyemes that further break down carbohydrates and proteins B. Creates a space for liquids to empty into C. Move waste up and out of the body D. Absorbs water from stool E. Absorbs water from stool and stores food that will be emptied into the rectumlts F. Moves stool into rectum 16. Secretes pancreatic juice, insulin, glucagon, duodenum, and somatostatin into the bloodstream.
d. Zach’s G.I. tract needs the substance to assist in the breakdown of food and for absorption. Epithelial cells extend into the lamina where they form secretory folds called gastric glands. Several of these glands open into the gastric pits and secretions from these glands flow into the pits. E. If Zach’s only normal digestive enzymes from his mouth, what
The cooked starch acts as the food, which the caterpillar would eat, and the alpha amylase, which is a digestive enzyme common in saliva, is stirred with it to simulate the chewing and mixing of food and saliva which constitutes the first step in the digestive system. Next two pieces of dialyses tubing were prepared by clamping one end of each piece of tubing shut with a clamp, and twisting the other end until it opens. For the purpose of the experiment, the tubing will represent the intestine of the caterpillar.Continuing on, a clean pipette was used to transfer four pipettes worth of the starch and alpha amylase solution into one of the pieces of tubing, while four pipettes of plain starch was added to the other in order to form a control. Next, two large beakers were filled two thirds of the way with distilled water. Four droppers worth of Lugol’s reagent was added two each beaker.
Discuss the importance of teeth in human nutrition Teeth perform mechanical digestion thus increasing the surface area of food for salivary amylase to work and for the enzymes of the stomach and small intestine to work more efficiently 2. Describe how food passes through the esophagus Food is pushed down the esophagus to the stomach through the process of peristalsis. Wave-like contractions alternate between contraction and relaxation to push the food through the entire digestive tract from the esophagus through the stomach, small intestine and large intestine. 3. Why would the enzymes in your mouth not work in your stomach and the enzymes in your stomach not work in your mouth?
Unit 5- Anatomy and Physiology for Health and Social care P2-Outline the structure of the main tissues of the body The stomach- The stomach is a muscular organ that is located on the left side of the upper abdomen. The stomach receives all the food from the esophagus, when the food reaches the end of the oesophagus it enters the stomach through a muscular valve which is known as the lower esophagus sphincter. The stomach muscles contract periodically, churning the food to enhance digestion. Phloric sphincter is a muscular valve which opens to allow food to pass from the stomach to the small intestine. Non-striated- There is non striated muscle in the stomach, it helps the digestive system in the process of digestion of food by causing mechanical digestion due to churning action as muscles contract.
SCI/241 THE SCIENCE OF NUTRITION January13,2012 Human Digestion How the does the digestive system works to absorbs nutrients? Digestion starts with the smell of food, it activates the salivary glands. The gland secret saliva that moistens food, it also contains a digestive enzyme called amylase that breaks down some carbohydrates before it leaves the mouth. Then the food is swallowed and goes into the lumen through the esophagus. The esophagus muscles contractions called peristalsis forces the food through the sphincter valve and into the stomach.