Cell Transport Notes:
All cells need to move materials in and out of the cell
What are some things that cells would need to transport in and out?
Carbon dioxide, water, oxygen, food, proteins
There are two types of transport that cells carry out: PASSIVE and ACTIVE
1. PASSIVE TRANSPORT:
When small particles move from a high to a low concentration, it is called passive
transport. This is the normal flow of materials.
There are two types of passive transport. Osmosis is when water is moving high
to low through a cell membrane, and diffusion is when all other small particles
move from high to low concentration.
This type of transport does NOT require ATP or energy
Here are some examples of this type of transport:
1. Cells getting rid of CO2
2. Cells taking in O2 for cellular respiration
3. Water moving across the cell membrane when needed or as a waste product
2. ACTIVE TRANSPORT:
When small particles move from a low to a high concentration, it is called active
transport. This is AGAINST the normal flow of materials.
This type of transport requires ATP or energy
If large particles need to enter or leave the cell, they require special types of
active transport called endocytosis and exocytosis
Endocytosis occurs when a cell needs to bring in large particles. Think about
“endo” sounding like “in the” cell
Exocytosis occurs when a cell needs to take out large particles. Think about “exo”
sounding like “exiting” the cell. This is how the Golgi ships proteins out of the cell.
Here are some examples of active transport:
EX: cells brining in large food particles, cells releasing waste, white
blood cells “eating” pathogens
