Digestion, sequence by which food is broken down and chemically converted so that it can be absorbed by the cells of an organism and used to maintain vital bodily functions. Apr 12, 2008 video made for a college class for fifth grade students. Bio 22 lab bettina lee josh protacio justin tcheng darla teylan exercise 17. Kjeldahl digestion apparatus available with 50750 ml flasks. To describe the emulsification of fat by bile salts 6. Alpha amylase begins carbohydrate digestion by breaking starch into maltose units two units of glucose bonded together. In order for cells to make the types of proteins they need they must first break down proteins into their building blocksamino acids. Place each of your egg white stems into four separate test tubes. After capturing and poisoning their prey with their venom, spiders use two different systems of external digestion. Introduction to the myth heres how it goes give students saltine crackers. Mechanical and chemical digestion lab digestion, human body. View notes chemical aspects of digestion lab report from biol 126 at gannon university. Pour 5 ml of water into the first test tube and label it w.
Digestion in your mouth place a cracker in your mouth without chewing for 1 minute. Lab report for digestive physiology leah stone course 2021 section 4 kelly boon march, 23 2015 2. Chemical digestion involves breaking chemical bonds to split the food into simpler nutrients. For details on the anatomy and physiology for specific. Chemistry of digestion lab presentation and conclusions by. You can take this experiment further and add a few squirts of different coloured food colouring to the food to mimic some of the digestive juices. Even though digestion takes place inside our bodies, we can do this simple digestion experiment to see the first steps of digestion in action. The purpose of this experiment is to observe what happens when nonpolar molecules, such as fats, come in contact. After a 60 minute incubation period, students analyze the tubes to discover which situation is optimal for digestion to occur. Digestion of starch by salivary amylase the digestion of a carbohydrate such as starch begins in the mouth, where is it mixed with saliva containing the enzyme salivary amylase. At the end of the lab you should have a completed student guide, a complete data table in the lab instructions and the answer to these questions.
Pour 5 ml of a 1% pepsin solution into the second test tube. Im happy to say that after several trials and adjustments at home. Apr 20, 2018 students observe chemical and mechanical digestion during this lab. To describe the enzymatic digestion of protein by pepsin 5. In this exercise, you will study the role of enzymes in digestion. Proteins are vital to most structural components of cells as well as to their chemistry. Protein digestion continued 2 21 inn ientii n ights esere figure 2.
The entire digestive process begins as soon as we enter the mouth, where saliva moistens us to make us easier to swallow. Every living cell contains from several hundred to several thousand different macromolecules known as proteins. Trace the path that the nutrients in a cheeseburger would take from being eaten to being absorbed into the bloodstream. In the first post, i talked about a demonstration i use with my science class to show what digestion looks and feels like in the mouth. You may not eat any of the food or misuse any of the digestive system lab equipment. Some pump digestive enzymes from the midgut into the prey and then suck the liquified tissues of the prey into the gut, eventually leaving behind the empty husk of the prey. Chemical digestion helps to break down food into individual nutrients that your body can absorb.
Take the prelab quiz on blackboard before you come to lab. Also available as a part of the digestive system teacher pack. It is the accepted convention that 1 unit of restriction endonuclease corresponds to the amount of enzyme required to completely digest 1 ug of lambda dna in 1 hr under optimal assay conditions. When the semiliquid becomes alkaline, gastric digestion ceases and intestinal digestion begins. Students will be able to model and describe mechanical and chemical digestion in the stomach. The digestion of starch by the enzyme amylase duration. Camp digestion cs mott childrens hospital michigan medicine. For this lab, we are going to use different objects to represent different parts of the digestive system. Digestion starts in the mouth, where chewing breaks down food into smaller pieces that can be easily swallowed and digested.
The enzyme aids in digestion by breaking down starch molecules present in the foods we eat. Chemical aspects of digestion lab report clarke 1 1. The first layer or mucosa consists of epithelium which covers connective tissue lamina propria and a thin muscle layer muscularis mucosa. It is fun to do handson activities in groups because it allows us to work together and discuss the results.
During this lab you will come in contact with food and other lab equipment. In the small intestine villi and microvilli form microscopic extensions of the mucosa layer which. Digestion in spiders after capturing and poisoning their prey with their venom, spiders use two different systems of external digestion. Enzymes are proteins secreted by organs of the digestive system that increase the rate of these chemical reactions. Chew the other half of the saltine cracker or 2 or 3 oyster crackers in your mouth very well so that it mixes with the saliva. The day of the lab i encourage students to bring a small portion of their favorite food about 5 grams. The stomach model lab can be used to introduce the stomach or mechanical and chemical digestion, as well as provide students a chance to continue learning after the concepts have been introduced. Be familiar with the biochemical tests for starch determine effects of enzymes, ph, and temperature on the digestion of carbohydrates objectives 3. Starch, a long chain of repeating glucose molecules, is hydrolyzed cut by amylase into shorter polysaccharide chains and eventually into. For details on the anatomy and physiology for specific digestive systems, see digestive system, human, and digestive system, invertebrate. In the stomach gastric pits form microscopic openings to gastric glands which secrete gastric juice. Experiment with salivary amylase enzyme this video shows a. See more ideas about teaching science, body systems and science classroom.
Digestion experiment weird unsocialized homeschoolers. Free stomach model digestion lab by science teacher. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Human digestion demonstration the bread in the bag.
Starch, a long chain of repeating glucose molecules, is hydrolyzed cut by amylase into shorter polysaccharide chains. Add 1 or 2 tablespoons of water to the cracker crumbs. State how the digestion of starch is affected by doing the following. This juice contains the enzyme amylase, which breaks starch down into glucose, which can be absorbed into the body through the lining of the small intestine. Digestive enzymes help to break carbohydrates into disaccharide and monosaccharide sugars. These handson digestion demonstrations are extremely simple to do. Most tissues, however, contain the enzyme catalase, which catalyzes the breakdown of peroxide to water and oxygen as follows. Students will be able to model and describe mechanical and. Some of the activities that are not handson involve lots of work.
Each apparatus has a very efficient glass exhaust manifold with funnel shaped adapters that fit into the necks of the flasks. Place a sucker in your mouth and leave it during the lab. Use caution when handling hydrochloric acid and artificial gastric juice. Apply the results of a laboratory examination to solving a specific crime scenario.
The gels were stained overnight prior to photographing or recording results. We are now being chewed into a bolus, a small ball of. Listing a study does not mean it has been evaluated by the u. An introduction to digestion student handout computers with internet access quiz an introduction to digestion student handout method. He is a handson learner so i wanted him to have a physical demonstration to present. Have students complete their vocabulary list on an introduction to digestion student handout by using their student. Explain how iodine and benedicts reagent indicate whether starch digestion has occurred.
Define monosaccharide, disaccharide, and polysaccharide, and give. The following activities are to be completed in your group of 34 students. The salivary glands secrete saliva, an alkaline fluid, to soften food, moisten the mouth and aid in the swallowing process. Answer the following questions based on your reading. To describe the enzymatic digestion of carbohydrates by salivary amylase 4. Mouth digestion lab by science teacher resources tpt. Chemistry of digestion lipids and chemistry honors project luzita francis spring 2014 durham technical community college carbohydrates concepts taught during lab. Spit the cracker and saliva mix into the second bowl. Which result shows the greatest amount of digestion of the protein of the egg white. Let students experience digestion while they learn.
Create marketing content that resonates with prezi video. That is why there are two results in each cell of the test results column. Saliva contains chemicals that are also important in breaking down food. The purpose of this experiment is to observe how quickly a starch can be broken down into a sugar and also to demonstrate and describe the action of digestive agents on two major nutrients carbohydrates and lipids. For our homeschool science fair my seven year old sons topic was the human digestive system.
Learn more about chemical digestion, including how it compares with mechanical digestion, its. Objectives describe and identify the signs of rigor. Describe the process of digestion in a human, citing examples from anatomy. The restriction digestion took place overnight and was kept in the freezer until the next class period when it was used for gel electrophoresis. Acidity of lipids structure of lipids fatty acids and glycerol speed of digestion micelles students. Free stomach model digestion lab by science teacher resources. Activity of restriction endonuclease can be affected by. Pancreatic juice is secreted by the pancreas into the duodenum. Video made for a college class for fifth grade students. With this printable, reproducible lab, students taste and feel digestion as they describe and analyze it.
Related searches biology lab answer key biology lab manual answers answers to biology lab manual biology labs online answers nys biology lab answer keys human biology lab manual answers biology lab quiz and answers biology 101 lab answers. Follow the instructions below, observe the outcome, and then answer the questions that follow. Amylase experiments saliva and cracker videos, activities. Instruct the students to choose a fresh cracker and chew it, no swallowing allowed. The esophagus is a tube that moves food from the mouth to the stomach after swallowing. You can approach the digestion of the mouth two ways. I have done bothit all depends on your gross out factor and the maturity of your students. Study 36 terms lab 8 digestive physiology flashcards.
In the experiments for the digestive physiology we focused on the digestion of proteins, carbohydrates and triglyceride lipids. Explorit science center is a non profit 501c3 california corporation founded in 1982. Mechanical digestion involves physically breaking the food down into smaller pieces without any chemical changes to the food. Digestion fill in the blanks food is digested by the churning of the stomach walls and by secretion. In lab, each group places a small amount of each macronutrient into different test tubes, simulating different situations in the body. Apr, 2015 ex 17 digestive physiology benedict s test 1. Human digestion demonstrationthe bread in the bag demo. Hydrogen peroxide h 2 o 2 is a common byproduct of metabolic reactions. An enzyme called salivary amylase begins to catalyze the breakup of starches by hydrolysis. In the above procedure, which test tube can be considered the control test tube and why. Students will be able to describe and analyze mechanical and chemical digestion of carbohydrates in the mouth. Make a digestive system model using crackers and bananas. The only materials needed are a box of saltine crackers. Teaching learning collaborative tlc life science the.
In this camp little victors activity, well learn how digestion works and even do a fun experiment that simulates the digestion. Students will be exposed to the major steps of digestion. Try this simple test to see physical and chemical digestion at work. I wanted a demonstration he could do with very little help from me and explain to an audience. Have students complete their vocabulary list on an introduction to digestion student handout by using their student handout notes andor other textbooks or resources available. Digestion is the breakdown of food by mechanical or chemical digestion. In this lab you will work with two different enzymes that digest carbohydrates and numerous food items. Record the time it took to dissolve or how much is left at the end of the lab, with the time. Apr 17, 20 human digestion demonstration the bread in the bag. Chemistry of digestion lab presentation and conclusions. Restriction enzyme digestion lab report restriction. This article summarizes the chemical actions of the digestive process. Digestion is the process of breaking down food into the nutrients our bodies can use. Explorit science center 3141 5th street, davis, ca 95618 send us feedback.
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