Cell Processes
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Transcript Cell Processes
Diffusion, Osmosis, Cellular Respiration &
Photosynthesis
Passive Transport
Particles move from an area of high concentration
to an area of low concentration.
NO ENERGY REQUIRED TO MAKE THIS WORK
AKA diffusion
Diffusion
Particles travel from an area of high
concentration to an area of low concentration.
This process does not require any energy from
the cell.
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.
html
Osmosis
A special kind of diffusion: Diffusion of
water
Diffusion of water through the cell
membrane that is so important that it has
its own special name.
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
http://www.indiana.edu/~phys215/lecture/lecnotes/diff.html
More Osmosis…
Water moves from an area of high concentration
to an area of low concentration.
See the picture on page 85
Osmosis and the Blood Cell
p.85
Putting the blood cell
in pure water without
salts makes water move
INTO the cell by
osmosis. The cell will
look bloated.
The water “tries to
balance itself on both
sides of the
membrane”.
Questions to Answer
What would happen
if we put the cell in
super salty
solution? Draw
what it would look
like below.
Active Transport
Active Transport-The cell must use energy to
move things into or out of the cell.
This is against the normal direction of
diffusion: From an area of LOW concentration
to an area of HIGH concentration.
Movement of Large Particles
Into Cell
Endocytosis- Cell membrane surrounds a
particle and encloses it in a vesicle.
See p. 87
Moves things INTO the cell
http://www.coolschool.ca/lor/BI12/unit4/U04L05/endocytosis_final.html
Movement of Large Particles
OUT of the Cell.
Exocytosis- Vesicles are formed at the ER or
Golgi Complex and are in a “packet” that moves to
the cell membrane for release.
Moves things OUT of the cell.
http://www.coolschool.ca/lor/BI12/unit4/U04L05/exocytosis.html
Cellular Respiration
NOT the same as respiration or
breathing…but breathing is required so that
cellular respiration can occur
Cellular respiration- The process where the
cell produces ATP (energy) in the cell from O2
and glucose; carbon dioxide and water are the
products.
Cellular Respiration
ALL ORGANISMS RESPIRE!
Know this Equation!!!
Reactants
Products
6O2 + C6H12O6 6CO2 + 6H2O + ATP
oxygen
glucose (sugar) carbon dioxide water energy
Where did they come from?
Where are they going?
air
food
waste
waste
Aerobic respiration: requires oxygen to be present.
Makes 46 ATP’s
Used/Stored
Fermentation
Remember “Feel the Burn”?
Fermentation is a process that makes
energy in the absence of O2 which is known
as anaerobic respiration.
Some organisms rely solely on
fermentation.
Yeast and some bacteria make CO2 and
alcohol as a product of the process.
Plant Food (Photosynthesis)
Plants have chlorophyll that capture light energy to
change CO2 and H2O into food (glucose).
Know this Equation!!!
http://wps.prenhall.com/wps/media/objects/486/498596/CDA7_1/CDA7_1b/CDA7
_1b.htm
Products
6CO2
Sun
+ 6H2O +
carbon dioxide
water
Where did they come from?
air or respiration
(same)
Reactants
C6H12O6 + 6O2
glucose (sugar)
oxygen
Where are they going?
respiration
respiration
fruit
air
Connecting Photosynthesis and
Cellular Respiration
Answer the following on the back of your notes page:
1.
2.
3.
4.
5.
Draw the figure on p. 90 on your own piece of paper.
Answer the following questions on the back
What do you notice about the two equations for
photosynthesis & respiration?
What happens to the ATP? Where does it go?
How is ATP used by the cell?
Explain in 3 sentences or more what is happening in
this figure.
How is the cell’s use of CO2 and H2O like people
recycling glass and paper?
Other
Processes
Digestion- Taking in food to break down for
energy
Waste Disposal- Products of cellular
respiration and unneeded products.
Growth- Using energy to increase in size.
Reproduction- To generate offspring with all or
shared characteristics of the parents.