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Gas exchange in Vertebrate
Descripción
Biology unit 2 Mapa Mental sobre Gas exchange in Vertebrate, creado por hayley el 10/04/2013.
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biology unit 2
biology unit 2
Mapa Mental por
hayley
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hayley
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Resumen del Recurso
Gas exchange in Vertebrate
Problems for terrestrial organisms with gas exchange
Water evaporates from their bodies = get dehydrated
Solutions!
Surfaces need to be thin
Permable
Large surface areas
The Lung
Birds and mammals are active. How have they adapted for gas exchange
With air, it is a less dense medium
Have internal lungs to reduce water loss
AMPHIBIANS
Gas exchange takes place through the skin and lungs
What does the skin act as
the surface of gas exchange with either water or air
Features of the skin
Moist
Permable
Well developed capillary network just below the surface
Features of the lungs
simple elastic sacs
Have a good blood supply
Have no diaphragm or rib cage
Lungs are inflated by forcing air into them by movements of the floor of the mouth
Reptiles
Examples of reptiles
Crocodile
Lizard
Snakes
Features of reptiles
Move on all four limbs without their bellies toughing the ground
The ribs
Have pairs of ribs that project from the backbone
Ribs provide. ....
Support
Protection to organs in the body cavity
Are involved in the ventilation of the lungs
The lung is complex and internal. More complex that the amphibians lung
Has an ingrowth of tissues
this increases the surface area for gas exchange
Birds
Birds use the lungs as their site for gas exchange
Large volumes of oxygen are needed to provide energy for flight
Ventilation of the lungs in birds in a lot more efficient as they have a system of air sacs
These air sacs function as bellows
The lungs ventilate by the movement of the ribs
During flight
flight muscles ventilate the lungs
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