The Working Cell (chapter 5)  Created by LoregonTrail85   Remove
ads  27 terms  selective permeability    Is passive transport.
Solutes naturally diffuse from high to low concentrations, and
the cell does not have to expend any energy. Small, non-polar
molecules can easily cross a cell through simple diffusion (fig
5.3)  passive transport  The diffusion of a substance across a
biological membrane with no expenditure of energy.   is the
diffusion of water. Water tends to diffuse toward high solute
concentrations, remember, "water follows salt." (fig 5.4)   The
ability of a solution surrounding a cell to cause that cell to
gain or lose water. Hypotonic, hypertonic, and isotonic.
Referring to a solution that, when surrounding a cell, has no
effect on the passage of water into or out of the cell.
Facilitated diffusion  requires a transport protein to
cross(FACILITATE) the cell membrane. However, it is still
passive transport (no energy required). Water, sugars, amino
acids, and many ions cross the membrane