GASEOUS EXCHANGE Respiratory surface Respiratory System in Human
- Slides: 29
GASEOUS EXCHANGE Respiratory surface Respiratory System in Human Control of breathing Gaseous exchange in Insect Gaseous exchange in Fish Gaseous exchange in Plant
Respiratory surface Small organisms surface volume ratio is large Larger organism surface volume ratio is small
Characteristics of respiratory surface Large surface area 2. Moistened surface 3. Thin and freely permeable to gases 4. With transport system 1.
Types
Human Respiratory System
Lung tissue
Mechanism of Breathing Animation
Treatment to inhaled air 1. Warmed nostrils by capillary in 2. Moistened by mucus 3. Cleaned and filtered cilia and mucus by hair,
Lung capacities Volume of air
Control of Breathing Respiratory centre Chemoreceptor p. CO 2
chemoreceptor 1. Peripheral chemoreceptor Detect both Po 2 and PCO 2 Carotid bodies, aortic bodies 2. Central chemoreceptors Detect PCO 2 Medulla Effect of PCO 2 is larger than Po 2
Respiratory centre l. In medulla oblongata l. Receive impulse from chemoreceptor l. Send impulse to diaphragm and intercostal muscle l. Change rate and depth of breathing
Effect to lung lp. O 2 decrease and p. CO 2 increase rate and depth of breathing increase lp. O 2 increase and p. CO 2 decrease Rate and depth of breathing decrease
Other effect lp. CO 2 increase l. Heart : rate increase l. Blood vessel: vasodilation l. Increase rate and volume of CO 2 transport
Partial pressure of CO 2 p. CO 2 increase Detected by chemorecetor Impulse to respiratory centre Impulse to intercostal and diaphragm muscle by efferent nerve Rate and depth of breathing increase p. CO 2 back to normal Feedback
Gaseous Exchange in insects Mechanism Abdomen movement, fluid movement
Trachea
Spiracle
During rest exercise less more fluid During exercise
Breathing in fish
Gill
Gill photo
Where is gaseous exchange taking place? Buccal surface Skin Gill in tapole
Bird
Gaseous Exchange in Plant No special organ for breathing but some special features in various organs for increasing surface area Leave Stem Root
Leave
Root Hair
Lenticel
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