Concept of Movement of Substances Across a Plasma Membrane (4)

Facilitated diffusion (3)

The process continues until a dynamic equilibrium is achieved when the concentration of molecules is the same at both sides of membranes

Facilitated diffusion through channel and carrier proteins (1)

Channel protein form channels or canals to allow small-sized solutes and ions to diffuse across the plasma membrane

Facilitated diffusion through channel and carrier proteins (3)

Channels have specific internal characteristics that only allow specific ions to pass through it

Facilitated diffusion through channel and carrier proteins (3)

Carrier proteins have specific sites and can only bind to a specific molecule

Characteristics of an active transport (1)

The movement of molecule or ion substances across a plasma membrane occurs against a concentration gradient

Characteristics of an active transport (2)

It requires energy from ATP (adenosine triphosphate) molecules generated during cellular respiration

Characteristics of an active transport (3)

It requires specific carrier protein with specific sites to bind with certain molecules or ions

Characteristics of an active transport (4)

Carrier proteins also possess receptors to bind with ATP molecules

Characteristics of an active transport (5)

- Carrier proteins change shape when a phosphate group attaches to it - As a result, molecules or ions move across a membrane

Active transport (1)

Active transport results in the accumulation or excretion of molecules or ions in the cell