cell membrane permeability

Diffusion of ions is when :

• Energy is needed

• Ions diffuse from high concentration to lower concentration

• Ions diffuse from low concentration to higher concentration

The cell membrane divides the intercellular only

• True

• False

Three factors can alter the channel protein conformations ?

• Ligand-gated ion channels

• Voltage-gated ion channels

• Mechanically gated ion channels

• All of above

The process of opening and closing ion channels is known as channel gating

• True

• False

The ion channels selectivity is based on the following EXCEPT:

• Channel diameter

• The charged and polar surface of the polypeptide

• Electrically attract or repel the ions

• The thickness of the cell membrane