k Simple diffusion its energy source O, CO,. NH. NO. etc k 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