Ion Permeation Can Be Described as

Ion permeation can be described as

A) simple diffusion of ions down their concentration gradient.
B) active transport of ions against their concentration gradient.
C) facilitated transport of ions against their concentration gradient.
D) hopping or jumping of ions along electrostatic binding sites in the pore driven by the concentration gradient and the charge across the membrane.
E) hopping or jumping of ions along electrostatic binding sites in the pore driven by the concentration gradient.