Why Your Heart Races When You Exercise – The GCSE Biology Breakdown

Ever wonder why your "heartbeat" speeds up during a workout? This fast GCSE "biology" explainer breaks down the fascinating chain reaction, showing how your muscles demand energy through "cellular respiration" and why your "heart beats fast" to deliver the fuel needed for "cardio" activity. Understand the incredible biological processes that keep your body moving. 👇 Subscribe for more fast, high-quality GCSE Biology videos!