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:

Amoeba Sisters Cellular Respiration 7:48

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.