alveoli and gas exchange

Question 1

what happens to oxygen

Answer 1

oxygen diffuses from alveoli into blood capillaries down a concentration gradient

Question 2

what happens to C02

Answer 2

carbon dioxide diffuses in the reverse direction

Question 3

what are alveoli adapted for

Answer 3

efficient gas exchange

Question 4

what do alveoli walls contain

Answer 4

elastic protein-elastin

Question 5

what does elastic allow alveoli to do

Answer 5

to expand during inspiration and to recoil to their original size during expiration

Question 6

how is each lung containing millions of alveoli which have folded walls a benefit

Answer 6

because gas exchange happens in the alveoli
and large surface area for fast diffusion

Question 7

how is alveolus walls being thin, made of one layer of flattered epithelium cells a benefit

Answer 7

because short diffusion distance for fast diffusion

Question 8

how is capillary walls being thin, made of one layer of flattened endothelium cells a benefit

Answer 8

short diffusion distance for fast diffusion

Question 9

how is ventilation bringing in fresh supplies of atmospheric air a benefit

Answer 9

it maintains a high concentration gradient for fast diffusion

Question 10

how is circulation of blood continually replacing blood high O2 with blood low In O2 a benefit

Answer 10

it maintains a high concentration gradient for fast diffusion