Simple diffusion its energy source O2,CO2,NH3,NO,etc. Facilitated diffusion its characteristics Facilitated diffusion via ion channel Chemically gated channel Voltage-gated channel Mechanically gated channel Nat,K+,Ca2+,Cl-channel Facilitated diffusion via carrier Glucose,amino acids,some ions,etc. * Simple diffusion & its energy source O2 , CO2 , NH3 , NO, etc. * Facilitated diffusion & its characteristics Facilitated diffusion via ion channel Chemically gated channel Voltage-gated channel Mechanically gated channel Na+ , K+ , Ca2+, Cl− channel Facilitated diffusion via carrier Glucose, amino acids, some ions, etc