For any carrier-mediated transport process, the rate of transport is dependent on 1. Number of carriers in the membrane 2. The affinity and the number of solute molecules bound to the carrier 3. The rate of translocation. Osmosis Passive movement of H2O in response to a H2O gradient.
Osmosis occurs in response to a concentration gradient for an impermeant solute.
If the solute is permeable, then diffusion of solute occurs. A cell will swell in a hypotonic solution and shrink in a hypertonic solution. A cell will swell in a hyposomotic solution but will not necessarily shrink in a hyperosmotic solution.