Topic: Food Energy and Respiration Subtopic: Diseases of the respiratory system
How does tar damage lungs?
Answer: Tar sticks on the alveoli walls making them hard and rough. When a smoker coughs, these walls breakdown reducing the surface area for the absorption of oxygen. Moreover, tar is also responsible for lung cancer.
- What is digestive system?
- What are products of respiration?
- How are fats digested?
- Where does bacteria in faeces come from?
- What is first step of digestive process?
- What is blood?