3.3.1 Surface Area to Volume Ratio Flashcards

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1
Q

What is the relationship between the surface area and volume of an organism?

A

As the size of an organism increases: volume increases more than surface area increases

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2
Q

What is the environment around cells of multi cellular liquid?

A

Tissue fluid

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3
Q

What organisms require a larger volume to surface area ratio?

A

Organisms with a higher metabolic rate exchange more materials so require a larger surface area to volume ratio

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4
Q

How have large organisms evolved to speed up the rate of diffusion?

A

A flattened shape so no cell is far from the surface

Specialised exchange surfaces with large surface areas

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5
Q

What are the characteristics of specialised exchange surfaces?

A

Large surface area relative to volume
Very thin so diffusion distance is reduced
Selectively permeable to allow selected materials across
Movement of the environmental medium maintains the concentration gradient
A transport system to ensure the moment of the internal medium

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6
Q

How do you have to represent the surface area to volume ratio?

A

Surface Area : Volume as SA : 1

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