Regional endothermy Flashcards
1
Q
What species have regional endothermy? give 3 examples.
A
- continuously swimming species
- tuna, mackerel sharks, swordfish
2
Q
What are 3 characteristics of fish with regional endothermy?
A
- large body size
- large cutaneous arteries/veins
- heat exchange organs
3
Q
What is the advantage of a large body size for fish that use regional endothermy?
A
- important for heat retention
- SA:V ratio is lower
4
Q
What does cutaneous mean?
A
- close to surface
5
Q
What are 2 advantages of large cutaneous arteries and veins in fish that use regional endothermy?
A
- transport blood between heart, gills and heat exchanger (heat retention)
- restricts heat loss from swimming muscle contraction
6
Q
What are heat exchange organs?
A
- rete mirabile
- red muscle (counter current)
7
Q
What are the differences between rete mirabile and gas bladder?
A
- R = larger + spaced out vessels, efficient for HEAT exchange
- G = smaller, tightly packed
8
Q
What is the main similarity between rete mirabile and gas bladder?
A
- gas and ion exchange
9
Q
Where is red muscle usually located? where is it in fish that use counter-current gas exchange?
A
- usually just on outside
- both outside and internalized
