5: Energy, Maintenance, and Environmental Exchange
In Unit 5, students discover the interaction between body systems and the outside environment for the exchange of materials, the capture of energy, the release of waste, and the overall maintenance of the internal systems that regulate the exchange. The explanations and illustrations are particularly focused on how structure relates to function.
Thumbnail: This image shows a cross section of a kidney. (CC BY-SA 3.0; Holly Fischer/Wikipedia).