Size and SA Flashcards
1
Q
explain SA:V ratio in smaller organisms
A
smaller organisms have a larger surface area compared to their volume
2
Q
why is the large SA:V ratio an advantage for smaller organisms?
A
- big SA for exchange
- small distance from outside of organism to the centre
- simple exchange of substances across the surface
3
Q
explain SA:V ratio in larger organisms
A
larger organisms have a smaller SA compared to their volume and therefore a larger distance between the outside of the organism to the centre
4
Q
what is metabolic rate
A
the speed of the chemical reactions
5
Q
how do larger organisms make exchange more efficient
A
adapatations
6
Q
how is the villi and microvilli adapted
A
- ## lots of folds > increases SA > increased SA:V ratio > faster absorption
7
Q
how are lungs adapted for gas exchange
A
- lots of alveoli > larger SA > larger SA:V ratio > faster absorption
- alveoli branch off into bronchioles > increases SA
8
Q
how are insects adapted
A
- spiracles across abdomen > larger SA
9
Q
how are plants adapted
A
- thin wide leaves > larger SA:V ratio
