Dr Baker

Created by: Emily:)<3
Created on: 07-12-12 11:12

Efficient exchange surfaces?

Large surface area//thin barrier to reduce diffusion distance//fresh or constant supply of molecules on one side to maintain a high concentration gradient//removal of required molecules on other side to keep the concentration low.

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How are lungs adapted for exchange?

Lrge surface area-provides more space for molecules to pass through//A barrier permeable to O2 and CO2-readily allows diffusion//Thin barrier-reduce diffusion distance-alveolus+capillary wall=1 cell thick//Maintain the diffusion gradient.

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What factors affect the need for a transport system?

Size//Surface areas to volume ratio//level of activity.

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Advantages of double circulation?

Delivery of oxygen and nutrients is quick//blood made to flow more quickly.

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Blood flow

Deoxygenated blood flows from the body to the vena cava and into the right atrium///Oxygenated blood from the lungs flows from the pulmonary vein into the left atrium.

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Other cards in this set

Card 2

Front

How are lungs adapted for exchange?

Back

Card 3

Front

What factors affect the need for a transport system?

Back

Card 4

Front

Advantages of double circulation?

Back

Card 5

Front

Blood flow

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Dr Baker