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GASEOUS EXCHANGE

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GASEOUS EXCHANGE Respiratory surface Respiratory System in Human Control of breathing Gaseous exchange in Insect Gaseous exchange in Fish Gaseous exchange in Plant – PowerPoint PPT presentation

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Title: GASEOUS EXCHANGE


1
GASEOUS EXCHANGE
  • Respiratory surface
  • Respiratory System in Human
  • Control of breathing
  • Gaseous exchange in Insect
  • Gaseous exchange in Fish
  • Gaseous exchange in Plant

2
Respiratory surface
  • Small organisms surface volume ratio is large
  • Larger organism surface volume ratio is small

3
Characteristics of respiratory surface
  1. Large surface area
  2. Moistened surface
  3. Thin and freely permeable to gases
  4. With transport system

4
Types
1
2
4
3
6
5
5
Human Respiratory System
6
Lung tissue
7
Mechanism of Breathing
Animation
Photo
8
(No Transcript)
9
Treatment to inhaled air
  • Warmed by capillary in nostrils
  • Moistened by mucus
  • Cleaned and filtered by hair, cilia and mucus

10
Lung capacities
Volume of air
11
Control of Breathing
Respiratory centre
Chemoreceptor
pCO2
12
chemoreceptor
  • 1. Peripheral chemoreceptor
  • Detect both Po2 and PCO2
  • Carotid bodies, aortic bodies
  • 2. Central chemoreceptors
  • Detect PCO2
  • Medulla
  • Effect of PCO2 is larger than Po2

13
Respiratory centre
  • In medulla oblongata
  • Receive impulse from chemoreceptor
  • Send impulse to diaphragm and intercostal muscle
  • Change rate and depth of breathing

14
Effect to lung
  • pO2 decrease and pCO2 increase rate and depth of
    breathing increase
  • pO2 increase and pCO2 decrease
  • Rate and depth of breathing decrease

15
Other effect
  • pCO2 increase
  • Heart rate increase
  • Blood vessel vasodilation
  • Increase rate and volume of CO2 transport

16
Partial pressure of CO2
pCO2 increase
17
Gaseous Exchange in insects
Mechanism Abdomen movement, fluid movement
18
Trachea
19
Spiracle
20
During exercise
During rest more fluid
During exercise less fluid
21
Breathing in fish
22
Gill
23
Gill photo
24
Where is gaseous exchange taking place?
Buccal surface
Gill in tapole
Skin
25
Bird
26
Gaseous Exchange in Plant
  • No special organ for breathing but some special
    features in various organs for increasing surface
    area

Leave
Stem
Root
27
Leave
28
Root Hair
29
Lenticel
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