Exchange surfaces Flashcards
1
Q
A
2
Q
A
Larger animals have a larger SA to Volume ratio
Meaning the rate of heat loss is lower
Allowing them to live at lower temperatures
3
Q
Humpback whales have been found to reduce their heart rate whilst still diving below the surface Explain why this is advantageous
A
Whales are mammals so they have lungs which means they cant take oxygen from teh water
Lowering the heart rate lowers the metabolic rates so less oxygen is used up and teh whale can stay underwater
4
Q
State 2 adapotatiosn of the lungs of mammals that maximise gas exchange
A
- Alveoli have large SA
- There is a short diffusion distance from the lungs ro the capillaries
