GCSE Biology - Exercise & Oxygen Debt (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. Energy requirements during exercise. Increased cellular respiration for muscle contraction. 2. How the body increases oxygen supply. Changes in breathing rate and volume. Changes in heart rate. 3. Aerobic and anaerobic respiration in muscles. Conditions leading to anaerobic respiration. 4. Lactic acid and oxygen debt. Production of lactic acid during anaerobic respiration. Muscle fatigue. Repayment of oxygen debt and removal of lactic acid via the liver. 5. Investigating the effects of exercise. Measuring breathing rate. Measuring heart rate (pulse). ** CHAPTERS ** 0:00 Introduction: Why Exercise Increases Respiration 0:31 Increased Breathing Rate & Volume 0:52 Increased Heart Rate 1:14 Aerobic vs Anaerobic Respiration 1:31 Lactic Acid 1:57 Oxygen Debt 2:31 Exercise Effects: Breathing Rate 2:52 Exercise Effects: Heart Rate ** PLAYLISTS **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #GCSE #Biology #study