Transport in Cells
Types of Transport
1. Passive Transport
It just happens because the
materials are small enough to
pass through
Vocabulary
Passive Transport: When materials
move through a membrane
Vocabulary
Membrane: A surrounding or
a covering
Passive Transport
During passive transport the
molecules move to create
equilibrium
Vocabulary
Equilibrium: when
everything is balanced
Passive Transport
Passive Transport
Two Types
• Diffusion
• Osmosis
Diffusion
HIGH CONCENTRATION  LOW CONCENTRATION
High energy molecules  Low energy molecules
[High]
[Low]
Vocabulary
Concentration: the
measure of the number
of molecules in an area
Diffusion
1. Movement of molecules from an
area of
to an area of
.
Diffusion
Diffusion
2. When molecules in solution
slowly spread apart over time.
Diffusion
Osmosis
Osmosis is the movement of WATER
across a semi-permeable membrane
It’s a special type of diffusion that only
moves
WATER
Vocabulary
Osmosis: is the movement of
WATER across a semipermeable membrane
Vocabulary
Permeable: allowing stuff to
pass through
Vocabulary
Semi-Permeable: allowing
some stuff to pass through
(go in or out)
Vocabulary
Active Transport: When materials
move through a membrane with
energy
Types of Transport
2. Active Transport
The materials are too big or the
wrong shape to just pass
through on their own
Active Transport
Cells need energy to move the
molecules
ATP (used in cellular respiration)
Sun Energy (used in photosynthesis)
Active Transport
Usually is the movement of
particles from an area of
to an area of
Real Life Application
Cells in our kidneys filter &
remove salt in our blood through
active transport