Cell Transport Benchmark

BY: Kevin Williams and Greg Alston


Diffusion is the process where molecules moves from area of high concentration to areas of low concentration.

Example in the body: Digested particles of food diffuse in the colon. (food particles like carbohydrates, proteins)

Why this example fits: The example fits the type of transport because when your food digest into different food particles , it then spreads each particle more widely into the colon which is making it easier for our bodies to digest pieces of food. After each bite we take, the particles of food move and diffuses into the colon. Basically, this goes hand and hand with diffusion because just like during diffusion, the digested food particles move from a higher concentration in the stomach , to a lower one in the colon.


Osmosis is the movement of water of across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.

Example in the body: Kidney Dialysis which is a treatment for life-support that can uses a machine that can filter or extract some waste which includes things like salt, excess fluid from the blood etc, which then restores the blood back to normal.

Why this example fits: Just like with osmosis, Kidney Dialysis is an example of it because the molecules pass through a less concentrated solution, to a more concentrated one which leads to everything being equaled out.

Facilitated Diffusion

Facilitated Diffusion is the transport if substances/molecules across the membrane from an area of higher to lower concentration.

Example in the body: Cells have a membrane protein that facilitates the diffusion of glucose from the bloodstream into the cell.

Why this example fits: This is an example of Facilitated diffusion because substances (glucose) are being transported across the cell membrane via protein carrier molecule.

Active Transport (Ion Pumps)

The movement of ions or molecules across a cell membrane into an area of higher concentration. This process is being helped by enzymes and energy is required.

Example in the body: The maintaining of a balance of sodium and potassium inside and outside a cell.

Why this example fits: Transport because this is the movement of molecules across the cell membrane into a larger concentrated area. With the balance of sodium and potassium having to be balanced some molecules () must travel from the lower concentrated area to a higher one so the two can balance out.


The process of which the cell takes in materials from outside of the cell by engulfing them. After they are engulfed they are then transferred to the Plasma Membrane.

Example in the body: White blood cells can surround bacteria.

Why this example fits: This example fits this transport because the white blood cells are being transported by a coated vacuole


Exocytosis is the process of which materials are released by the secretory vesicles.

Example in the body: Sections of enzymes from pancreatic cells and hormones from endocrine gland

Why this example fits: This example fits the transport because with Exocytosis , it's a process where the cell and become enclosed by pocketing the cell membrane to create a vesicle. With these sections of the pancreatic cell and hormones from endocrine gland it shows that these substances do become enclosed and create vesicles in the human body