The aim of the lesson today is to: 1.. Surface Area to Volume Ratio.

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Presentation transcript:

The aim of the lesson today is to: 1.

Surface Area to Volume Ratio

Length of edge of cube / cm Surface area of whole cube / cm 2 Volume of cube / cm 3 Ratio of surface area to volume (χ:1)

Length of edge of cube / cm Surface area of whole cube / cm 2 Volume of cube / cm 3 Ratio of surface area to volume (χ:1)

Length of edge of cube / cm Surface area of whole cube / cm 2 Volume of cube / cm 3 Ratio of surface area to volume (χ:1)

Length of edge of cube / cm Surface area of whole cube / cm 2 Volume of cube / cm 3 Ratio of surface area to volume

Features of Specialised Exchange Surfaces. Large SA:Vol – increase rate of exchange Very thin – diffusion distance is short Partially permeable – allows selected materials to cross unobstructed Movement of environmental medium (air/water) – maintains diffusion gradient Movement of internal medium (blood) – to maintain diffusion gradient

Fick’s Law Diffusion∞ surface area x diff. in conc. length of diffusion path