<prompt> Diffusion of gas in the respiratory membraneDirectly proportional to thickness of respiratory membraneInversely proportional to molecular weight of the gasNo lipid - water solubilityInversely proportional to pressure gradient  <response>: The rate of diffusion of gas across the respiratory membrane is- Directly proportional to The pressure gradient across the membraneLipid solubility of the gas The surface area of the membrane- Inversely proportional toThe thickness of the membraneThe molecular weight of the gas 