2. It is a biochemical process of oxidation of
organic compounds in an orderly manner for
the liberation of chemical energy
The site of gaseous exchange is called the
respiratory surface.
3. Physical process
Features:
a) Large surface area
b) Should be thin,highly
vascular and permeable
to allow exchange of
gases
c) moist
4. IN PLANTS
Diffusion takes place
through stomata
• IN ANIMALS
• Diffusion takes
place through
special respiratory
systrem
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17. • Spongy and elastic lungs
• Present in the THORACIC
CAVITY.
• A double PLEURAL MEMBRANE,
outer PARIETAL AND inner
VISCERAL MEMBRANE
• Lubricating fluid
• The right lung is larger and
divided into 3 lobes, while the
left lung is SMALLER AND divided
into 2 lobes.
• EACH lobe of the lung HAS the
TERMINAL bronchioles ending in
A bunch of AIR SACS, EACH with
10 to 12 ALVEOLI
21. • Partial pressure of Carbon di
oxide in blood capillaries is
45mmHg in blood
Capillaries
• In alveolar air- 40mmHg
CO2 from blood air
• Partial pressure of oxygen in
alveolar air is 104mmHg
• In Blood -40mmHg
O2 from air Blood
22. Diffusion of gases will takes place from
an area of higher Partial pressure to an area
of lower PARTIAL pressure until the PARTIAL
pressure in the two regions REACHES
equilibrium.
Alveolus -A layer of simple Squamous
epithelium resting on A BASEMENT
MEMBRANE.
23. Transport of carbon
dioxide
a) By Plasma in solution
form(7%)
b) By bicarbonate
ions(70%
C) By Red blood
cells(23%)
Transport of oxygen
a) Bohr effect
b) Haldane effect
24.
25.
26.
27. • This oxygen -
HAEMOGLOBIN
DISSOCIATION curve is A
SIGMOID curve AND it
shifts TOWARDS the right
due to
- INCREASE in H+
CONCENTRATION,
INCREASE in ppCO2
AND rise in
TEMPREATURE AND rise
in DPG (2, 3
DIPHOSPHOGLYCERATE)
, formed in the RBCs
during glycolysis.
- It lowers the Afinity of
HAEMOGLOBIN for oxygen.
