CIE A Level Biology復習筆記4.2.7 Surface Area to Volume Ratios

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月10日下午12:31

Principles of SA:V

Surface area?and?volume?are both very important factors in the?exchange of materials?in organisms
The surface area refers to the?total area of the organism that is exposed to the external environment
The volume refers to the?total internal volume of the organism?(total amount of space inside the organism)
As the surface area and volume of an organism increase (and therefore the overall ‘size’ of the organism increases), the surface area : volume ratio?decreases
This is because?volume increases much more rapidly than surface area as size increases

11.-Principles-of-surface-area-_-volume

As size increases, the surface area : volume ratio decreases

Calculating-SA_V-ratios

The surface area:volume ratio calculation differs for different shapes (these shapes can reflect different cells or organisms)

Exam Tip

You are expected to be able to calculate the SA:V ratio for a cube, cuboid or cylinder and explain how the increasing size of an organism affects the SA:V ratio.

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