3.3.1 SA:V ratio Flashcards by Leora Meyer

Q

True or false? Bigger organisms have a smaller SA:V ration than smaller organisms

A

TRUE

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Q

Why is a large SA:V ratio important in organisms?

A

Increases metabolic rate

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Q

How do organisms with smaller SA:V ratios adapt to facilitate exchange?

A

Short diffusion pathways - capillary walls only one cell thick
Folds in the membranes of cells eg. villi and microvilli
Maintained concentration gradient - heart pumps blood around the body so that blood in the lungs have a low concentration of oxygen, encouraging diffusion
Proteins - protein channel and carriers facilitate diffusion and active transport

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