gas exhange biology

Question 1

name the adaptations of the alvoli

Answer 1

• lots of capillaries- circulation constantly removing oxygenated blood which maintains a concentration gradient
  -high surface area more diffusion and shorter diffusion pathway
  -constant venlation constant supply of oxygen and lower levels of co2

Question 2

what happens during inhalation

Answer 2

digraph contracts moves down- external intercourse muscles contraction moves
- increases thorax volume decreases pressure air moves down the pressure gradient

Question 3

what is the difference between forced and non forced expiration

Answer 3

forced uses intercostal muscles whereas non forced is just the relaxation of muscles