Three Types of Passive Transport

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moving cellular material

cells take in food, oxygen, and other substances from the environment and release waste into the the environment

selectively (semi) permeable

regulates what enters and exits the cell, it is based on the size of the particles and the size of the openings in the membrane.

passive transport

the result if a substance moves through the membrane without the input of energy.


when molecules move from an area of higher concentration to an area of lower concentration.


diffusion of water from an area of higher concentration to an area of lower concentration

Fascilitated Diffusion

Some molecules can only enter and exit the cell with the help of molecules in the cell membrane called transport proteins.m

hydrophilic region


hydrophobic region



when the relative number of molecules are equal in the two areas; diffusion stops when this is reached

concentration gradient

a difference between concentrations in a space

What happens when water leaves plant cells?

the plant becomes limp

What make up most of the cell membrane?

proteins and phospholipids

What happens when water leaves an animal cell?

The cell shrinks

What Happens When too much water enters an animal Cell?

It will burst


Amount of water transported into the cell is equal to the amount transported out.


Water is transported out of the cell and the cell shrinks.


water is transported into the cell and the cell eventually bursts

Active Transports

Moving material against the concentration gradient requires energy


The process of taking substances into the cell by surrounding it by the cell membrane


Contents of a vesicle can be released by a cell.

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