How your digestive system works TED-Ed

Across the planet, humans eat on average between 1 and 2.7 kilograms of food a day, and every last scrap makes its way through the digestive system. Comprised of ten organs covering nine meters, this is one of the most complicated systems in the body. Emma Bryce explains how the different parts of the digestive system work to transform your food into the nutrients and energy that keep you alive. Continue reading

Origins Of The Anus – Earth Unplugged

We all have an anus, but there was a time in our evolutionary past when our distant ancestors did not. In this video, Maddie Moate talks you through the origins and why we have what we have. Subscribe to Earth Unplugged for more amazing animal videos Continue reading

Chemistry Life Hacks: Food Edition

Reactions is back with another round of chemistry life hacks. Our latest episode brings chemistry to the kitchen, and features science-backed tips to cook rice with fewer calories, get extra juicy chicken (when you don’t have time to marinate) and keep sliced fruit from browning too quickly. Continue reading

Teacher Demos: A. Digestive enzymes, B. Control of Breathing, C. Baroreceptor Reflex


These three demos allow students to experience applications of knowledge of the digestive, respiratory, and circulatory systems by doing very short activities on themselves.   They also allow the opportunity to discuss the pros and cons of using humans as test subjects.  It is very useful for students to get the idea that scientific experiments do not have to be very complicated. Continue reading

ChemMatters – Digestion: The Disassembly Line

You could call digestion a disassembly line. Your body takes whatever morsel of food you give it, breaks it down, wrings out all the nutrients it can, and discards the waste. It’s an amazing example of chemistry in action, and it happens 24/7. Our body relies on three major types of food: carbohydrates, fats and proteins. In this latest episode of ChemMatters, find out how the body breaks down these big three food groups and puts their nutrients to use.