The epiglottis stops any of the sandwich entering the windpipe by covering the windpipe hole. In the stomach the sandwich is churched and then mixed with gastric juices and the muscular walls of the stomach churn the contents into a liquid called chyme. The gastric juices contain mucus which moistens the food, they also contain the enzyme pepsin and hydrochloric acid which pepsin needs to work effectively. The pepsin breaks down proteins (the beef) to peptides and amino acids. Chyme is squirted from the stomach into the duodenum and then enters the small intestine.
The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals. What Is the Function of the Digestive System? The primary function of the digestive system is to break down the food we eat into smaller parts so the body can use them to build and nourish cells and provide energy. Structure of Human Digestive System * Mouth The mouth is the beginning of the digestive tract; and, in fact, digestion starts here when taking the first bite of food. 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.
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
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.
The epiglottis then prevents choking by directing the bolus into the esophagus. The circular muscles in the esophagus wall contract, squeezing the bolus downward toward the stomach traveling in length of two or three seconds. At the base of the esophagus, where the esophagus and stomach join, a thick ring of muscle called a sphincter is found. This sphincter acts like a valve, as it allows food to pass into the stomach but does not permit it to pass back up through the esophagus. The stomach, a large muscle sack, contains three sets of glands which produce gastric fluids.
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.
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.
3. _____ Herbivores use their molars/premolars to grind and crush food. 4. _____ Long canines are present in both carnivores and herbivores. 5.
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.
In between gulps of this nutritious meal, let us sneak in to his cavernous mouth. As we glide between his lips, which are pulled apart by his orbicularus oris, allow me to narrate our marvelous journey… through the digestive system. Digestion, a pertinent component of survival,