November 03, 2014
How do living organisms get their energy
from food?
November 03, 2014
As food moves through the
digestive system:
it goes through a series of chemical
reactions in which it is broken down
and rearranged to form new
molecules of Glucose!
November 03, 2014
Cellular Respiration- this is the process in which
cells obtain energy from glucose(food)
* This occurs in BOTH plant and animal cells*
They both have mitochondria!
November 03, 2014
The process.....
1.Animals take in nutrients from the food they eat
and break it down into glucose(our main energy
source). Plants make glucose through
photosynthesis.
2. The glucose reacts with the O2 (is oxidized) to
release ATP(Adenosine Triphosphate) which is
energy our cells need to carry out everyday
functions (growth, repair, development etc.)
*About 40% of the energy from glucose is
released as ATP, the rest is released as HEAT
3. CO2 and H2O are the products
November 03, 2014
Equation!
C6H12O6 + 6O2
glucose
oxygen
6CO2 + 6H2O + ATP
carbon dioxide
water
energy
November 03, 2014
What do you notice about
photosynthesis and respiration?
They are opposites!! They form a
cycle that keeps O2 and CO2 in the
atmosphere in constant amounts
animation
November 03, 2014
https://www.youtube.com/watch?v=eo5XndJaz-Y
brainpopphotosynthesis
brainpop-respiration
November 03, 2014
What if your body does not have enough oxygen
to break down food?
FERMENTATION! This is when food is broken
down without O2
It does release less energy than resipration
When you are completely worn out and feel like
you can't go anymore.....you then get that painful
sensation in your muscles (lactic acid)
http://www.brainpop.com/science/cellularlifeandgenetics/cellularrespiration/
November 03, 2014