1. Alveoli-Gaseous Exchange and Aerobic and Anaerobic Respiration GCSE – PHYSICAL EDUCATION – YEAR 11

2. ALVEOLI GASEOUS EXCHANGE Gaseous Exchange = Swapping of Oxygen and Carbon Dioxide Why do they swap? Due to the pressure gradients (difference) of the gases at the alveoli. The percentage of oxygen in the lungs (stuff coming!) is much higher than that at the capillaries arriving at the lungs (stuff going out!). Due to this percentage difference, the oxygen diffuses from the lungs the blood.

3. THINK OF PEOPLE ON A BUSY STRESSED TUBE AS OXYGEN IN THE LUNGS AND AN EMPTY PLATFORM THE CAPILLARIES RETURNING FROM THE WITH LOW LEVELS OF OXYGEN

4. ALVEOLI GASEOUS EXCHANGE But… It’s not just the oxygen that is being exchanged. The waste product Carbon Dioxide is moving in the opposite direction. HIGH LEVELS OF CARBON DIOXIDE WHERE? LOW LEVELS OF CARBON DIOXIDE WHERE? WHAT CAUSES THEM TO MOVE? THE D_________ IN P__________ IN BLOOD VESSELS RETURNING FROM BODY IN THE LUNGS DIFFERENCE IN PRESSURE

5. ALVEOLI GASEOUS EXCHANGE An athlete who commits to a P.E.P. which focuses on endurance training will see improve in this swapping of gases. Regular training will result in increased alveoli and therefore increased capillaries. If we combine these two together we will see… Increased ?????? uptake and the athlete training for ???? Periods. OXYGEN LONGER

6. AEROBIC AND ANAEROBIC RESPIRATION For us to exercise we need one simple thing… ENERGY. We get this energy from our… FOOD. There are two situations we put our bodies through when exercising: Releasing energy using oxygen = AEROBIC And Releasing energy without using oxygen = ANAEROBIC

7. AEROBIC RESPIRATION But more oxygen is released if we have oxygen present. That deep breathing we experience when exercising is therefore crucial… GLUCOSE OXYGEN CARBON DIOXIDE WATERENERGY GIVESGIVES

8. ANAEROBIC RESPIRATION When intensity of exercise is too high, oxygen can’t be supplied quickly enough!!

9. ANAEROBIC RESPIRATION WE CAN’T USE THIS RESPIRATION FOR A LONG PERIOD OF TIME IT STARTS TO PRODUCE LACTIC ACID MUSCLES START TO FATIGUE BODY GOES IN TO OXYGEN DEBT BREATHING RATE INCREASES

10. AEROBIC V ANAEROBIC Creating Your Own Resources