Exchange of materials, Transporting substances around the body, Microbiology

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  • Created by: Chloe
  • Created on: 20-05-10 16:30

Exchange of materials - Active transport

OSMOSIS and DIFFUSION are the movement of substances from a higher concentration to a lower concentration.

ACTIVE TRANSPORT - takes substances AGAINST a concentration gradient and involves energy

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Exchange of gases in the lungs

Lungs exchange OXYGEN (needed for AEROBIC respiration) and CARBON DIOXIDE (waste respiration product). The lungs are protected by the rib cage and are separated from the digestive organs in the lower part of the body by the diaphram.

The lungs are adapted to make gas exchange more efficient by:


RICH BLOOD SUPPLY - maintain a high concentration gradient THIN

Allows diffusion to take place quickly

Oxyegn diffuses into the capilaries surrounding the alveoli and carbon dioxide diffuses back out into the lungs

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