Download CELLULAR TRANSPORT

CELLULAR TRANSPORT
PASSIVE VS. ACTIVE
PASSIVE TRANSPORT
• Characteristics
– No energy required
– Used move small particles
– Move from area of high concentration  area
low concentration
– Purpose: maintain equilibrium
• Types:
– Diffusion – general term
– Osmosis – movement of water
PASSIVE TRANSPORT
• Permeability –
ability of substance
to pass thru
– Impermeable:
allows nothing
in/out
– Permeable: allows
materials in/out
– Selectively
permeable; allows
some things in/out
HYPERTONIC SOLUTION
• Solution –
– High concentration of
dissolved particles
– Low concentration of
water
• Cell –
– Low concentration of
dissolved particles
– High concentration
water
• Water moves out cell
HYPOTONIC SOLUTION
• Solution –
– Low concentration of
dissolved particles
– High concentration of
water
• Cell –
– High concentration of
dissolved particles
– Low concentration
water
• Water moves into cell
ISOTONIC SOLUTION
• Solution & cell have
same concentration of
water and dissolved
particles
• Water will move both
in & out of the cell
• Ideal sitation
OSMOSIS & DIFFUSION
OSMOSIS IN PLANTS &
ANIMALS
OSMOSIS IN PLANTS
• Plasmolysis –
• Turgor Pressure –
cytoplasm shrink
water pressure makes
away from cell wall
plant stand up straight
– Lack of tugor pressure
causes plants to wilt
– Rarely happens in
nature – extreme
condition
OSMOSIS IN ANIMALS
• Cytolysis – water
moves into cell until
membrane bursts
• Contractile vacuole
– found in single celled
aquatic organisms
– Pumps water out to
prevent cytolysis
FACILLITATED DIFFUSION
• Characteristics
– No energy required
– Used move larger particles that will not fit
through c.membrane
• Use a protein doorway
– Move from area of high concentration  area
low concentration
– Purpose: maintain equilibrium
FACILLITATED DIFFUSION
ACTIVE TRANSPORT
• Characteristics
– Energy required
– Used move large particles
– Move from area of low concentration  area
high concentration
– Purpose: go against natural flow of diffusion
– A.T. in your body:
• Immune system – wbc consume bacteria/viruses
• Nervous system – chemical signals trigger neurons
• Skeletal muscles – chemical signals trigger fibers
contract/relax
ACTIVE TRANSPORT
ENDOCYTOSIS
• Brings particles into cell
– Phagocytosis –
consumption of solids
– Pinocytosis – consumption
of liquids
EXCYTOSIS
• Removes particles from
cell
Facil. Diffusion vs. Active Transport
CELL TRANSPORT