Internal vs External gills Flashcards
1
Q
Describe characteristics of internal gills
A
- covered by operculum
- positioned within gill slits
- irrigated mainly by buccal-opercular pump
1
Q
What does the buccal-opercular pump function as?
A
- ventilation
2
Q
external gills are found on ____ fish. 3 examples include:
A
- few
- larval chondrichthyans, juvenile polypterians and lungfish
3
Q
Describe characteristics of external gills.
A
- irrigated by movement through water
- accessory organ?
4
Q
What is the function of the lung
A
- air breathing
- tidal ventilation
5
Q
What is the main feature of external gills?
A
- exposed/vulnerable
- rare
6
Q
How do external gills ventilate?
A
- water moves past
7
Q
What is the main feature of internal gills?
A
- protected by operculum
- ventilation
8
Q
What is a chondrichthyan embryo?
A
- shark egg case (gas exchange)
