Gill
Structure of the Dogfish Shark
Key
1.
Holobranch
2.
Parabranchial Gill Chamber
3.
Afferent Branchial Arteries
4.
Hemibranch
The gills of the shark are lined on either side by gill filaments. These
gill types are called holobranchs. The gills associated with the spiracle
and sixth gill are hemibranchs because gill filaments are found on
one side only. An afferent branchial arteriole runs along the interbranchial
septum. Numerous capillaries branch from this arteriole into the secondary
lamella where air is exchanged.
