Respiration is a chemical process where organic compounds are broken down to release energy, carbon dioxide, and water or alcohol. It occurs in cells through two main stages: glycolysis and the Krebs cycle. Aerobic respiration involves the breakdown of glucose in the presence of oxygen to produce carbon dioxide, water, and ATP energy through a series of enzyme-controlled reactions in the cytoplasm and mitochondria. Conditions like glucose, oxygen, respiratory enzymes, proper temperature, and removal of byproducts are necessary for aerobic respiration to take place.

1. What is respiration?
By Peter
RESPIRATION

2. A chemical process where organic
compounds are broken to release energy,
carbon (IV) oxide and water or alcohol in
cells
IMPORTANCE
Production of energy required
for;
Growth and repair of tissues
Locomotion
Transmission of nerve impulses

3. Click in to the following link and
watch the video.
 http://www.mhhe.com/biosci/bio_animations/MH0
1_CellularRespiration_Web/index.html

4. Synonyms;
 Tissue respiration or Internal respiration
SITE; Mitochondrion (plural-
mitochondria)
N.B;
Respiration IS NOT same as gaseous
exchange
Gaseous exchange is a physical
process, while respiration is a chemical
process.
Gaseous exchange occur at respiratory

5. RESPIRATION SITE and
STRUCTURE

6. MORE IMAGES

7. TYPES OF RESPIRATION
 There are two types of respiration
 Aerobic respiration – break down of food
substances in presence of oxygen
C6H1206 + 6O2 RESPIRATORY ENZYMES 6CO2 + 6H2O +
Energy (ATP)
(Glucose) + (Oxygen) Carbon (IV) Oxide +
Water + Energy
 In aerobic respiration, a lot of energy is given off
 Anaerobic respiration – breakdown of food
substances in absence of oxygen. Products are
dependent of organism; plant or animal. Less
energy is given off.

8. AEROBIC RESPIRATION
 Food is broken down in presence of
oxygen to release energy, carbon (IV)
oxide and water.
 The energy drives chemical reaction
where ADP (Adenosine diphosphate)
combines with inorganic phosphate
molecule to form ATP (Adenosine
triphosphate).
 Occurs in two phases;
First phase (GLYCOLYSIS)
Second phase (KREB’S CYCLE)

9. AEROBIC RESPIRATION
GLYCOLYSIS KREBS CYCLE
 Occurs in cytoplasm
in absence of oxygen.
 Involves breakdown
of glucose to form
pyruvic acid and
energy.
 Two ATP molecules
formed from one
molecule of glucose
 Occurs in matrix of
mitochondrion.
 In presence of oxygen,
pyruvic acid is oxidized
in a series of enzymatic
reactions to form
energy, carbon (IV)
oxide and water.
 36 - 38 ATP molecules
formed from one
glucose molecule.

10. CHEMICAL EQUATION FOR
AEROBIC RESPIRATION
 C6H1206 CYTOPLASM CH3COCOOH + 6O2
MITOCHONDRIA 6CO2 + 6H2O + Energy (ATP)
(Glucose) Pyruvic acid + (Oxygen)
Carbon (IV) Oxide + Water + Energy (ATP)
 In cytoplasm and mitochondria, several enzyme
controlled reactions takes place.
 There are conditions necessary for aerobic
respiration to take place.
 They are as follows;

11. CONDITIONS NECESSARY FOR
AEROBIC RESPIRATION
 Cells must be provided with glucose/food.
 Oxygen must be taken in and react with the
glucose.
 There must be respiratory enzymes to catalyze
the reaction.
 Proper temperature must be maintained for
efficient enzyme functioning.
 The end products of reaction must be constantly
be removed from the mitochondrion. They include
carbon (IV) oxide, water and energy.