RESPIRATION
• RESPIRATION: The process in which nutrient molecules
are broken down into simpler
substances with or without the help of oxygen and it
results in the release of energy.
It involves the action of enzymes in cells.
WE NEED ENERGY FOR:
• Eg:
a) cell division and growth
b) synthesis of protiens, fats, vitamins, etc
c) active transport
d) conduction of nerve impulses and muscular movement
e) maintenance of constant body temperature
ATP ( ADENOSINE TRI PHOSPHATE)
• It is an energy rich molecule.
• It is synthesized in mitochondria.
• Energy stored in ATPs which is used by the cells .
TYPES OF RESPIRATION
• AEROBIC RESPIRATION
It is the breakdown of glucose in the presence of oxygen
with the release of energy. In this process, the glucose is
completely oxidized to carbon dioxide and water which
are released as waste products.
WORD EQUATION:
Glucose + Oxygen _________ Carbon dioxide + Water + Energy
CHEMICAL EQUATION :
C6H12O6 + 6O2
_____________CO2 +
H2O
+ Energy
(2830kJ)
ANAEROBIC RESPIRATION
• The respiration which takes place in the absence
of oxygen called Anaerobic Respiration.
The end products of anaerobic respiration in bacteria
and fungi are ethanol (alcohol) and carbon dioxide,
whereas in animals lactic acid is produced.
In bacteria and fungi
FERMENTATION
C6H12O6 ______________ 2C2H5OH + 2CO2 + Energy(118KJ)
Glucose
Ethanol
Carbon dioxide
In Animals
C6H12O6
Glucose
_______________ 2C3H6O3 + Energy
Lactic acid
AEROBIC
Oxygen
Energy
Used
High energy yield
ANAEROBIC
Not Used
Low energy yield
Waste
Carbon dioxide and Water Ethanol, lactic acid and
products
Carbon dioxide
Occurs in
Mitochondria
Cytoplasm
Organism All advanced organism
yeast, bacteria, fungi and
higher organisms when O2 in
short supply/ vigorous
exercise in higher animals
OXYGEN DEBT
The amount of oxygen needed to remove the lactic acid
from the muscles and blood is known as Oxygen Debt.
OXYGEN DEFICIT VS OXYGEN DEBT
Alcohol Fermentation : Anaerobic respiration of bacteria and
fungi is known as “Alcoholic fermentation”.
Click to add text
Lactic acid Fermentation :
When oxygen is deficient, human muscle make ATP by the process
of anaerobic respiration which is commonly known
as “Lactic acid fermentation”.
THE EFFECT OF
TEMPERATURE ON
YEAST RESPIRATION