TOPIC 3: Mass Transport Systems
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10 Terms
The larger the organism…
The smaller the SA:V ratio
The smaller the organism…
The larger the SA:V ratio
What does the SA:V ratio effect?
Diffusion
How will diffusion be if the SA:V ratio is large?
Fast
What is a unicellular organism?
Comprised of only one cell
What is a multicellular organism?
Comprised of more than one cell
Which organism will have a higher metabolic demand?
Multicellular
→ Requires more substances, e.g., glucose, to be transported
Can large organisms rely on diffusion to meet their metabolic demands?
No.
They require mass transport systems & specialised exchange surfaces to get the substances they need.
→ As they have a small SA:V ratio= diffusion is slow
What is a specialised exchange surface?
Alveoli & villi
What is a mass transport system?
A system, which enables the bulk transport of materials in an organism.
e.g., circulatory system
Note 
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