The cells of smokers often use anaerobic respiration more than those of non-smokers.
Suggest one substance in cigarette smoke that may cause this.
[1 mark]
Explain why this substance has this effect.
[2 marks]
2) The respiratory system struggles to distribute air around the body because carbon monoxide deprives the blood cells of oxygen. This results in shortness of breath, particularly when undertaking strenuous activities.
