exam Q's

Question 1

explain how alveoli create a surface for efficient gaseous exchange

Answer 1

• squamous epithelial wall which is one cell thick provides a short diffusion distance

-large number of alveoli = increases surface area for diffusion

-small in size providing a large surface area to volume ratio

-they have a good blood supply which maintains a steep concentration gradient

-the are elastic and can recoil which helps with ventilation

Question 2

what is pulmonary ventilation

Answer 2

breathing rate x tidal volume