Food Energy and Respiration - Science Learning 11

Learn Food Energy and Respiration questions with answers. This prep guide includes questions like, how does tar damage lungs?, what happens if less oxygen is absorbed in blood?, what are chances of smoker of getting lung cancer?, what gas is present in cigarette?, what are harmful effects of carbon dioxide? and others below.

Food Energy and Respiration Learning 11

Question: 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.

Question: What happens if less oxygen is absorbed in blood?

Answer: If less oxygen is absorbed in the blood, cells would start respiring anaerobically. This would keep on producing lactic acid which would cause excess tiredness. This is why smokers have least stamina. They even suffer from dizziness and tiredness due to tar.

Question: What are chances of smoker of getting lung cancer?

Answer: Smoker have fourteen times more chances than a non-smoker of having lung cancer. This is only due to the presence of tar in the cigarette.

Question: What gas is present in cigarette?

Answer: There are two different harmful gases present in the cigarette. One of these is Carbon dioxide and the other one is Carbon monoxide.

Question: What are harmful effects of carbon dioxide?

Answer: Carbon dioxide enters the blood vessels from the alveolar walls. Instead of oxygen, they get absorbed in the red blood cells, decreasing the efficiency of carrying oxygen to the cells.