![]() The circulatory system consists of the heart, blood vessels, and blood. The walls of the lungs are filled with capillaries, which are microscopic blood vessels through which materials pass into and out of the blood. The respiratory system consists of the nostrils and the larynx, which opens into two lungs, hollow sacs with thin walls. Indigestible materials pass through the large intestine and then into the cloaca, the common exit chamber of the digestive, excretory, and reproductive systems. The contents of the common bile duct flow into the small intestine, where most of the digestion and absorption of food into the bloodstream takes place. Bile flows into a tube called the common bile duct, into which pancreatic juice, a digestive juice from the pancreas, also flows. Bile is a digestive juice made by the liver and stored in the gallbladder. From the esophagus, swallowed food moves into the stomach and then into the small intestine. The digestive system consists of the organs of the digestive tract, or food tube, and the digestive glands. In the pharynx, there are several openings: one into the esophagus, the tube into which food is swallowed one into the glottis, through which air enters the larynx, or voice box and two into the Eustachian tubes, which connect the pharynx to the ear. Also inside the mouth behind the tongue is the pharynx, or throat. Inside the mouth are two internal nares, or openings into the nostrils two vomerine teeth in the middle of the roof of the mouth and two maxillary teeth at the sides of the mouth. The third lid, called the nictitating membrane, is transparent. On the outside of the frog’s head are two external nares, or nostrils two tympani, or eardrums and two eyes, each of which has three lids. Please contact Digital Frog at if you are interested in arranging a workshop for your school district.As members of the class Amphibia, frogs may live some of their adult lives on land, but they must return to water to reproduce. Digital Frog International offers school districts a free three-hour workshop on the benefits of using their software programs. With continuing budget crunches and ethical and environmental concerns, more and more science teachers are looking to replace animal dissection in their classrooms. Use discount code PETA30 for a 30 percent discount on all products at Digital Frog International’s website. ![]() Receive a 30 percent discount on the Digital Frog 2.5 program and other educational software products when purchased through the PETA Web site. ![]() With context-sensitive definitions on every word and spoken pronunciations on significant words, students can access all the information they need with just a click of the mouse.ĭigital Frog International has undertaken an in-depth evaluation of the ways that its programs meet the educational needs of K-12 students in eight states. The independent California Learning Resource Network has also evaluated the Digital Frog software tools and found that they meet the state of California’s educational objectives. A fascinating ecology section reminds students that biology is the study of living organisms. ![]() Evaluations from these sessions show that educators who attended strongly agreed that the sessions were useful, that they intended to use the material in their classrooms, and that the presentation should be offered at future NSTA conferences.ĭigital Frog 2.5 is so much more effective than a wet lab because the interactive dissection is seamlessly linked to a comprehensive anatomy and physiology section, with human anatomy comparisons. Harrison recently gave a presentation titled, “Virtual Dissection: The Best of the Best” at the National Science Teachers Association (NSTA) national conferences in November 2007 and March 2008, in which she offered demonstrations of DryLabPlus Fetal Pig and Digital Frog 2.5.
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