Fish respiration Flashcards
How does the lamprey breathe?
Tidal ventilation (branchial muscles expand and contract both drawing in and expelling h2o through the gills)
Squalus acanthias can switch between two types of respiration
Ram ventilation and active ventiliation
What is ram ventilation?
When you have no operculum so you must keep moving to respire
What is active ventiliation?
Opening and closing mouth to breathe
Buccal pumping is used for what?
Active ventiliation in some sharks, skates, and rays.
Rajiforms are what kind of ventilators?
Active ventilators
Whats the evolutionsry theory of the 2 branchial arches in cyclostomatas?
The mandibular and hyoid arch became the gnathostomata jaw bones… Jaws may have evolved for respiration.
How do actinoptergyii mainly respirate?
Gill pumping! They pump h2o from their mouth, out of their gills.
How to sarcopterygii mainly respirate?
Coelcanthiformes have vestigial lungs so they use their gills to respirate while the lungfish were the first to develop 2 LOBED ALVEOLAR LUNGS!!
What species was the beginning of the double circulatory system?
Lungfish! Most fish had a unidirectional system
Most fish are poikilothermic meaning…
Their internal temp varies, often with the environment
Regional heterotherny refers to what
having different parts of the body at different temperatures
How does countercurrent heat exchange work?
Cold arterial blood entering the body from the gills encounter a net of warm venous blood exiting the tissue (heat is generated by swimming)
Most fishes are stenohaline meaning they can tolerate a narrow range if salinity but which one of our species is euryhaline?
Petromyzon marinus (sea lamprey)
Which of the cyclostomata are isomolar?
Hagfish (myxine glutinosa), they are in osmotic equilibrium with sea water
