Diffusion related to 02 transport across
respiratory membrane is an example of?
a) Simple diffusion
b) Facilitated diffusion
c) Active diffusion
d) Osmotic diffusion
Correct Answer - A
Ans. A. Simple diffusion.
[Ref. Ganong 25thle p. 51 & 24thle p. 53]
Simple diffusion - Movement of fats, oxygen, CO, through lipid
portion of membrane.
Facilitated diffusion - Movement of glucose and some amino-acids.
Primary active transport - Ions K+, Na*,
Secondary active transport - Glucose or or amino-acid into the cell
along Na` (Sympoft or cotransport) 1-1+ out of the cell against Na+
(Antiport or countertransport).