Cellular respiration is the process by which glucose and oxygen are broken down to produce carbon dioxide, water, and ATP through a series of chemical reactions. This occurs inside the mitochondria of plant, animal, bacteria, and other living cells. The process transfers energy from glucose to ATP and transforms glucose and oxygen into carbon dioxide, water, and energy-storing ATP molecules that power cellular functions. Cellular respiration and photosynthesis are connected processes, as respiration uses the glucose and oxygen produced by photosynthesis and produces the carbon dioxide and water needed for photosynthesis.

1. BIOLOGY
Unit 3 Notes:
Cellular
Respiration

2. (1) What is Respiration?
The reacting of glucose
(sugar) and oxygen gas,
producing carbon dioxide
gas, water, and ATP.

4. (2) The Chemical Equation
REACTANTS PRODUCTS
C6H12O6 + O2  Sunlight + CO2 + H2O
Carbon
Dioxide
Water
Glucose
(Sugar)
Oxygen

5. (3) Where does it happen?
• Inside all living things
(Plants, Animals, Bacteria, etc).
• Inside the organelle called the
Mitochondrion.

7. (4) How Does It Cycle Matter + Energy?
• ENERGY:
– Transfers energy from the bonds of glucose to
the bonds of ATP.
• MATTER:
– Takes glucose and oxygen, breaks their bonds,
in order to store energy in the newly formed
ATP molecules.
– Makes un-useable sugar compounds, into
energy storing molecules used by the cell.

8. (5) Connecting Photosynthesis
& Respiration
• The glucose and oxygen produced in
photosynthesis is necessary to begin
cellular respiration.
• The carbon dioxide and water needed to
begin photosynthesis, is made during
cellular respiration.