Life Processes-Respiration by MEHNAZ

1
LIFE PROCESSES- RESPIRATION
By -Mehnaz lt3
2
CONTENT

• Respiration.

3
Introduction

• The maintenance functions of living organisms
  must go on even when they are not doing anything
  particular . Even when we are just sitting in
  class, even if we are asleep this has to go on.
  The processes which together perform this
  maintenance job are CALLED life processes.
• we need to have a source of energy from external
  environment to our internal body,
• These sources need to be broken down or built up
  in the body and must be converted to the kind of
  molecules the body needs to grow. The processes
  of breakdown of food sources to release energy is
  called respiration.
• Let us discuss the life process- Respiration,
  which is essential to maintain life.

4
RESPIRATION

• All living organisms require energy to carry out
  life processes. This energy comes from food.
• Respiration commonly involves the use of Oxygen
  to break down carbohydrates and other organic
  molecules, giving usable energy, Carbon dioxide
  and water in the process.
• Respiration involves the exchange of gases and
  oxidation of food in the presence of air to
  release energy.
• Inhalation and exhalation of air occur due to
  change in air pressure in lungs
• Diffusion helps in exchange of gases in lungs and
  tissues.
• Respiration is a type of exothermic reaction that
  is it liberates energy

5
Aerobic Respiration
The complete oxidation of food resulting in the
release of LARGE amount of energy in the presence
of oxygen is called aerobic respiration. Aerobic
respiration takes place inside the mitochondria.
After glycolysis, pyruvate enters the
mitochondria and is oxidized. The products of
these reactions include ATP, Carbon dioxide and
water. the energy made available is much greater
than in the case of anaerobic respiration. Inside
the mitochondria, when an inorganic phosphate
group (P) gets attached to a compound called ADP,
a molecule of ATP is formed. ADP P ?
ATP(ENERGY CURRENCY)
6
Anaerobic Respiration
Partial oxidation of food in the absence of
oxygen, resulting in the release of some amount
of energy, is called anaerobic respiration.
Anaerobic means without oxygen or in the absence
of oxygen, while aerobic means with oxygen.
Glucose has six carbon atoms joined to each
other . Hydrogen and oxygen atoms are also
attached to these carbon atoms. In anaerobic
respiration of glucose, some hydrogen atoms are
removed from it, resulting in oxidation. At the
end of a series of reactions, glucose gets
converted into two molecules of pyruvate. This
process is called glycolysis. After glycolysis,
pyruvate gets converted into different compounds
depending on whether the further reaction takes
place in the presence of oxygen or not. Less
energy is generated from anaerobic respiration
7
Human Respiratory System
The human respiratory system consists of a pair
of lungs and a series of air passages leading to
the lungs. The entire passage consists of the
nose, pharynx, larynx ,trachea, bronchi and
bronchioles.
8

• Air enter through the nostrils. The hairs and
  mucus traps the dust particles. It then passes
  through the pharynx, larynx, trachea, bronchi and
  enters the lungs. The trachea has rings of
  cartilage which prevents it from collapsing when
  there is no air in the trachea. The bronchi
  divides into smaller tubes called bronchioles
  which ends in tiny air sacs called alveoli. The
  alveoli is supplied with blood vessels through
  which exchange of gases takes place. The alveoli
  helps to increase the surface area for the
  exchange of gases.

9
(No Transcript)
10
True or false?
FALSE TRUE FALSE FALSE TRUE FALSE
1. Respiration means breathing. 2. Respiration
occurs in all body cells. 3. Respiration gives
out oxygen. 4. Carbon dioxide is used up by
respiration. 5. Respiration is a chemical process
that releases energy. 6. Plants do not respire.
11
RECAP

• we LEARNED
• Introduction to life processes
• What is meant by respiration?
• Two types of respiration
• AEROBIC AND anaerobic.
• HUMAN RESPIRATORY SYSTEM
• ACTIVITY-
• TRUE OR FALSE.

12
Credits-Prepared by-Mehnaz Fatima. all the
amazing people watching this PowerPoint
presentationThank u!!!hope u all liked my
presentation