Gas exchange concepts- Gino-Dean Flashcards
Breathing
The mechanical whereby air moves in and out of the lungs.
Gaseous exchange
the exchange of oxygen and carbon dioxide across a gaseous surface.
Cellular respiration
The gradual release of energy from organic compounds in the presence of oxygen.
Diffusion
The movement of molecules from a high concentration to a low concentration until equilibrium is reached.
Necessity of gaseous exchange
To make oxygen available for respiration
Remove carbon dioxide
High carbon dioxide concentration can lower the pH level for body fluids.
Requirements for effective gaseous exchange
The gaseous exchange surface:
- must be large
- must be thin
- should be moist
- must have a transport system
- must be well protected.
Why must gaseous exchange surface be large?
To maximise gaseous exchange.
Why must the gaseous surface be thin?
For quick and easy diffusion.
Why should the gaseous exchange surface be moist?
oxygen and carbon dioxide must be in solution in order to diffuse through a membrane.
Why must the gaseous exchange surface have a transport system?
For efficient transport of gases.
Why must the gaseous exchange surface be well protected?
It is very thin and fragile.
Where does gaseous take place in plants?
Gaseous exchange primarily takes place in the leaves
