KS3 Bitesize foundation level – Humans as Organisms part 1 – a video covering nutrition & the digestive system, the skeletal system & how muscles work, then finally the process of Respiration and the Respiratory System.
Find a video lesson on this sub-topic atDan Rott videos, or many assessment statements are covered by Stephanie Castle (with more being added all the time).
In Crash Course Biology #7 –ATP & Respiration, in which Hank does some push-ups for science and describes the “economy” of cellular respiration and the various processes whereby our bodies create energy in the form of ATP.
For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. A powerpoint can be downloaded from the same site here. The s-cool revision sitelets you revise the topic, summarizes the topic & tests you on it. Skooolgives you a lesson, including progress questions, for each Biology topic but you’ll need sound on for it. GCSE Bitesize has revision pages (that take you through the topic), a test and an activity.