BIOLOGY FORM TWO TOPIC 5: GASEOUS EXCHANGE AND RESPIRATION

The Concept of Gaseous Exchange
Organs Responsible for Gaseous Exchange in Living Organisms
Identify organs responsible for gaseous exchange in living organisms
Organs responsible for gaseous exchange in living organisms include the following:
ORGANISMRESPIRATORY SURFACE
AmoebaCell membrane
InsectsTracheal system
SpiderBook lung
FishGills
PlantsLeaves, stems, roots
AmphibiansSkin, gills and lungs
MammalsLungs
BirdsLungs
reptilesLungs
Features of Respiratory Surface
  1. They are thin to reduce diffusion distance
  2. They are moist to dissolve gaseous so that they dissolve and diffuse in solution form
  3. They are highly braced, folded or flattened in order to increase the surface area for gaseous exchange
  4. They are close to efficient transport and exchange easily by the cells
  5. They are well ventilated so that gaseous passes easily
The Concept of Gaseous Exchange
Explain the concept of gaseous exchange
Gaseous exchange refers to the movement of oxygen and carbon dioxide across the respiratory surface. Is the process through which respiratory gaseous are passed through the respiratory surface. Respiratory surface are specialized organs for gaseous exchange. Gaseous exchange takes place through a process of diffusion.

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