Dr. Dave’s Science Teaching Manuals Hands-on, inquiry-based science How to teach, interest and excite elementary and middle school children in science. PRACTICAL INNOVATIVE CHILD-CENTERED Each unit has: • experiments, projects, and artwork to enable children to discover and construct knowledge for themselves • visual and eye-catching activities to impart simple scientific concepts • jokes that appeal to children and help them remember • safety, clean-up, and how-to-save-money tips • suggestions for further study for gifted or more advanced students • advice on how to deal with potential disruptions and diversions Each heavily illustrated, full-color manual comes with a CD with stunning pictures and diagrams to proj- ect for visual learners. Reproducible worksheets The activities are easily adaptable for homeschoolers, giving parents a practical guide and simple explanation of important scientific principles, and natural phenomena. These guides will enliven and clarify teaching and inspire students for real academic success. Royal Fireworks Press rfwp.com Dr. David Purvis “Teaching science to children can be the most wonderful and exciting experience. But having content knowledge is not enough for success at upper elementary-middle school level; what a teacher really needs to know is how-to-teach, how to engage students in hands-on, inquiry-based science.” —Dr. David Purvis, Assistant Professor of Education, Marist College, Poughkeepsie, New York ‘Dr. Dave’ is a university academic and a classroom teacher dedicated to improving and energiz- ing science teaching for children. After obtaining his doctorate in Microbiology and conducting post- doctoral research at the Roche Institute of Molecular Biology, Dr. Purvis decided to become certified to teach in the New Jersey public school system. During twenty years of teaching science at elementary, middle, secondary and college levels, he has developed the innovative activities and approach practiced in these books. Dr. Purvis has been Visiting Professor, Rutgers University New Brunswick, New Jersey, a consultant for the Columbia University School, and continues to volunteer as a guest teacher in the classrooms of local schools. As well as being the author of Dr. Dave’s Science Teaching Manuals , he gives workshops for teach- ers about Hands-on Science. To book Dr. Purvis for a workshop or seminar, contact: Dr. T. M. Kemnitz, Royal Fireworks Press Box 399 Unionville, NY 10988 tel: 845 726 4444 or email: [email protected] Based on his years of experience as a classroom science teacher and now as a men- tor and instructor to budding science teachers, Dr. Purvis has written one of the most comprehensive, creative and useful manuals for teaching science it has been my plea- sure to read. His devotion to constructivist pedagogies and love of science as a way of knowing and understanding the world is evinced on every page. All science teachers, whether just beginning their careers or seasoned educators, will derive great benefit from Dr. Purvis’s meticulous and innovative approach to a wide range of topics. —Marc A. Meyer, M.Phil., Ph.D, Associate Head of School, Brown School, Schenectady, New York rfwp.com The Digestive System Everything you need to teach a unit on the Digestive Systemem is here, with full-color illustrations, hints and tips and detailed activi-vi - ties. There are diagrams and colorful images for classroom presen-en - tations on the accompanying CD. The aim of the manual is to enable children to discover and construct knowledge for themselves and to give teachers the resources and information to make the learning exciting. There are dozens of activities and topics to choose from at various levels and a wonderful ‘end-of-it-all’ class demonstration to simulate how the digestive system works. The easy lesson demonstrations use basic materials such as crackers, constrconstruc-uc - tion paper, oil, and marshmallows. There are reproducible worksheetsrksheets to offeofferr as homework or in- class assignments; safety tips, advice on how to keep students focused; enrichment extensions, vocabulary word lists, and puzzles reinforce the learning of them. 7756 Dr. Dave’s Teaching Manual: Digestive System $40.00 Special Price $30.00 Topic: The Small Intestine and Lactase Extension: The small intestine is sub-divided into three sections: the duodenum, jejunum, and ileum. Think of a mnemonic for DJI to help your students remember this sequence. Project this image of the small intestine and reiterate how long the Topic Sequence pathway actually is. Point out how folded and Digestive System testines are. Observe the sharp turns in some parts of the pathway, and tell your class that food moves slowly through the intestine, Topic: Esophagus and the Stomach convoluted spending anywhere from two to six hours. Once again, don’t the hold in- your students accountable for this fact. Topic: The Small Intestine and Lactase Student Activity – The Human Digestive System • The assignment can be given at any grade level, and it can be made to any size. In general, stu- 2. EnzymeEnzym at Dierent Temperatures Page dents glue construction paper cutouts of the various organs onto a human body outline. The size of the human body outline can range from actual student size to a standard piece of construction Students can test the activity of the enzyme in an ice water-bath, at room temperature and in a paper. Older students are able to construct smaller, more precise models. If you have one, human models of the digestive system are excellent boiling water-bath.w Add the same amount of enzyme to each tube, and let them sit for 5 minutes Topic visuals to show to your class; these models help students visualize the at the temperaturete before dipping in the glucose test strip. Give directions to your class on how to cut out and glue the placement of the digestive organs within the scale of the whole human Digestion in the Mouth ...............................................................1 Materials: human body outline onto a black piece of construction paper. If body. You can use the model as you progress through the digestive sys- glue you use white glue, it’s handy to have small plates and tooth- tem, showing the respective organs as you cover them. While many of Materials: Esophagus and the Stomach .......................................................8 construction paper picks available. these models are very expensive, models that are more economical can Be sure students understand that the milk itself should be at test tubtubes, ice, hot water the correct temperatures before the enzyme is added. The scissors Teaching tip: It may be difficult for students with motor diffi - be purchased from some suppliers. milk The Small Intestine and Lactase ...............................................12 human body template Digestive Enzymes in the Small Intestine tubes of milk should already be in the ice and hot water-bath culties to cut out the outline. lactase when the enzyme is added. Otherwise, the enzyme will have markers The important point to teach about the small intestine is that the majority of chemical digestion oc- Proteases in the Small Intestine ................................................18 • pipettes a chance to work until the temperature is reached. curs in the small intestine. Tell your class that the small intestine secretes many glucose test strips The Digestion of Fats ...............................................................24 • Students draw and cut out the organs of the digestive system from dif- to finish the chemical digestion of the food slurry that comes from the stomach. Here in the small ferent colored construction paper. After gluing them on, the organs are intestine food is completely broken down into small molecules. The small intestine is also where The Large Intestine (or the end of it all!) .................................26 Safety tip:ti Keep the boiling water-bath secure and be sure stu- labeled to finish the assignment. Tell your students to be sure to leave the majority of nutrients from food are absorbed into the bloodstream. Project or write the notes below to introduce your class to these enzymes. Take this opportunity to review with your students dents use caution when removing the tubes. If you don’t have enough room for a title if desired. digestive enzymes the names of enzymes and their substrates. any test tube holders, use cups. Only one student per group should be at this station. Safety goggles are recommended. TEACHER RESOURCES .......................................................31 Teaching tip: Consider running this activity as an in-class assignment (instead of a homework assignment). For students who may not finish in one class—have small envelopes for them to store unglued pieces. 3. VaryingVaryi the Concentration of the Enzyme Most found in the small intestine Students prepare several cups, and vary the amount of enzyme added to each one. The materials Larger scale models can be made, although these are more cumbersome for classroom construc- used in thist variation are the same as those listed in the previous experiment. tion and storage. As before, construction paper can be used to cut out and labeled with the vari- Digestive Lactase – breaks down lactose in dairy products ous organs of the digestive system. The cutouts are then glued on. Students can also label the Enzymes lungs, heart, and brain to gain a more thorough perspective of the human body. 4. ComparingCompa Dierent Brands Proteases – break down proteins Teaching tip: Both diagrams are excellent examples of integrating art Students add the same amount of enzyme from different manufacturers, and test each sample at into your science curriculum. Students whose academic strength lies Lipases – break down lipids, fats, oils the same time. within the visual realm of multiple intelligence will enjoy completing this assignment and others like it. Fact: The human body produces over 20 different digestive enzymes. Some of these are sold as supplements by certain companies to treat digestive disorders. 5. What is the Eect of pH? • These projects are very large, so if you don’t have the wall space for This is simples to run if you already have bottles of the pH buffers available.