3- Smoking

Question 1

tar

Answer 1

it causes the goblet cells to produce thick mucus which is difficult to remove
it paralyses the cilia cells, so mucus trickles down into the alveoli causing infections and coughing which damaged the alveoli
it sticks to the inside of the alveoli which makes gas exchange difficult

Question 2

nicotine

Answer 2

it causes addiction and the narrowing of arteries and increases the risk of heart attacks

Question 3

carbon monoxide

Answer 3

this passes through the wall of alveoli into the capillaries.
it enters the red blood cells where it binds with haemogloblin
this means that less oxygen can be transported by the red blood cells to all the cells of the body