Exchange- Size And Surface Area Flashcards
What SA:V ratio do large animals have
Small ratio
What SA:V ratio do small animals have
Large ratio
Why is diffusion easier is single called organisms rather than multi called organisms
Multi celled organisms have a small surface area to volume ratio and also a big distance between cells and outside environment
What does a large surface area and small volume mean in terms of heat
Heat lost more easily
What does a small surface area and large volume mean in terms of heat
Harder to lose heat
Why do smaller organisms need a high metabolic rate
It loses heat more easily due to its large relative surface area so high metabolic rate generates enough heat to help it stay warm
What does a compact shape mean for organisms
Small surface area to volume ratio so less heat loss
What does a less compact shape mean for organisms
Large surface area to volume ratio so more heat loss
What adaptations do animals with large surface area to volume ratio have
Altered kidney structures to secrete less urine
How do mammals in cold areas adapt
Eat high energy foods
What do small mammals have to help them in cold weather
Thick fur / hibernate
How do large organisms in hot areas adapt
As they find it hard to keep cool due to their slow heat loss, animals like elephants for example have large ears to provide large SA so so more heat can be lost
