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The Energy CyclePhotosynthesis
Cellular Respiration
Glucose
ATP
Stomata
Chlorophyll
Light EnergyAutotroph
Heterotroph
PigmentOxidation
Heat Energy
Joules
Calories
MS Science Frameworks
MSF8.3h: Describe how an organism gets energy from oxidizing its food and releasing some of its energy as heat. (DOK 1)
CELLULAR RESPIRATIONThe Energy Cycle
Cellular RespirationThe process by which cells break down simple food
molecules such as glucose to release the energy (ATP) they contain. All living things need a constant supply of energy; therefore the cells of all living things carry out
cellular respiration continuously.
[reactants] [products] ( 38ATP)
Respiration is a two-stage process.
First Stage-Takes place in the cytoplasm
Glucose (C6H
12O
6) molecules are
broken down into smaller molecules . C
3H
40
3
Second Stage- Takes place in the mitochondria of animal and plant cells. C
3H
40
3 moves in from the cytoplasm and
O2 is added to it.
C3H
4O
3 are broken down into even smaller
molecules. (CO2 and H
20)
During this stage energy from broken bonds is captured in 34 ATP which store and transport energy that all cells need to live.
Photosynthesis and respiration are opposite processes.
C6H12O6 + 6O2 6CO2 + 6H2O + energy
Photosynthesis consumes energy and respiration releases energy.
Photosynthesis equation:
Cellular respiration equation:
Oxidation - the process of adding oxygen to a substance and forming an “oxide”. (What “oxide” is formed?)
Some of the energy released in respiration is lost as heat energy.
We measure this heat energy in units called Calories (English) or Joules (metric unit).
Calories are used to describe the energy-producing potential of food.
A one gram calorie is equal to 4.1840 joules.
Joule (which is an SI unit) is now more preferred over calorie (which is non-SI unit) for measuring heat energy.
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