All living organisms respire. Respiration releases energy from glucose so that life processes can carry on. Aerobic respiration needs oxygen but anaerobic respiration does not. The respiratory system is adapted for gas exchange to maximise the absorption of oxygen for respiration.

Task 3c: Make notes that:

• Define breathing

• Describe how pressure changes in the lungs cause inhalation and exhalation

• Suggest what could cause an increase or decrease in breathing rate

Task 3e: Complete the progress quiz

Task 4c: Make notes that:

• Define gas exchange

• Draw a diagram to show the diffusion of oxygen and carbon dioxide in the lungs

• Describe the process of gas exchange

• Explain how the lungs are adapted to allow gas exchange with the atmosphere

• Suggest how smoking can prevent this happening

Task 5c: Make notes that:

• List the harmful substances in a cigarette

• Explain how each of these harmful substances affect the lungs and gas exchange

• Define asthma

• Explain how asthma affects the lungs

• Describe what happens during an asthma attack

Task 7c: Make notes that:

• Describe the effect of exercise on heart rate (use your results to help you)

• Suggest why this happens (keywords: respiration, energy, oxygen)

• Suggest improvements to be made to the method if you were to repeat the experiment

• Suggest potential sources of error in the experiment

Task 9b: Make notes that:

• Define fermentation

• Give the word equation for fermentation

• Give the uses of the products of fermentation

• Complete the questions on slide 18

• Suggest how a bakery might use this information.

• Suggest what else they would need to consider.