Intro to Cell Transport

These types of transport use energy. Your cell only uses these in cases where passive transport will not work.

​Active Transport

These types of transport don't use energy and are preferred by your cells

Passive Transport

• Protein Pumps

• Endocytosis

• Exocytosis

​Active Transport

• Diffusion

• Facilitated Diffusion

• Osmosis

Passive Transport

Diffusion is when things spread out from areas of higher concentration to areas of lower concentration because the random motion of particles.


Moving down the concentration gradient.

Diffusion is when things spread out from areas of higher concentration to areas of lower concentration because the random motion of particles.


Moving down the concentration gradient.

Molecules that are too big (or too polar) to diffusion on their own can use the help of a gateway.



The gate/channel facilitates the diffusion of the molecule.

Osmosis is diffusion through a semipermeable membrane.




We will come back to this

There are slightly different names for this type of transport.

But the key is a protein uses energy to push molecules up the concentration gradient.

This is how your cell moves really big things in (Endo) and our (Exo).



In endocytosis, the cell membrane makes a bubble (vesicle) around the thing to bring in.


In exocytosis, the opposite happens, and a vesicle fuses with the cell membrane to release its contents.

​Sodium Potassium Pump

​3 Na+ Out, 2 K+ In