Question

Mechanisms through which transportation of substances occurs in cell membrane

Answer 1

hey mate...

here is your answer...

Facilitated diffusion uses integral membrane proteins to move polar or charged substances across the hydrophobic regions of the membrane. Channel proteins can aid in the facilitated diffusion of substances by forming a hydrophilic passage through the plasma membrane through which polar and charged substances can pass.

hope it helps...

Answer 2

Answer:

cell membrane is selectively permeable.

diffusion :-this process used only neutral atom .

osmosis:-only for water .

facilitated diffusion:-having carrier protein called aquaporins (in plasma membrane having integral protein which we called aquaporins and by this transportation method full fill their need (like lack of minerals and salts).