The pathway or air and gaseous exchange

Question 1

describe the pathway of air

Answer 1

-enters through nose and mouth
-travels down the trachea
-splits off into one of the bronchi
-branches off into the bronchioles
-travels to the alveoli for gaseous exchange

Question 2

define gaseous exchange

Answer 2

the process of which oxygen diffuses into the blood stream and carbon dioxide is removed from it

Question 3

list the adaptations the alveoli have for efficient gas exchange

Answer 3

-large surface area
-walls one cell thick
-moist lining
-surrounded by a network of capillaries
-well ventilated