lecture exam 3 Flashcards
Define Afferent
Carries towards a structure
Define Efferent
Carries away from a structure
How many gill pouches do Hagfish have?
5-15
What is the pattern of respiration for most Hagfish?
H2O > Velar chamber > afferent branchial ducts > 1 duct + slit
How many pairs of gill pouches and gill slits do Lampreys have?
7 pairs
What type of ventilation do Lampreys use?
Tital Ventilation
What is tital ventilation?
Water or air goes in and out of the same opening
How many gill pouches do Chondricthyes have?
5 pairs
What is the spiricle?
A one-way valve
What is a demibranch?
Each gill surface
What is a holobranch
2 demibranchs + interbranchial septum
Describe one side of the pharynx of Chondrichthyes.
1 pseudobranch, 4 holobranchs, and 1 demibranch
What structure allows water flow into the first two gill pouches?
Spiracle
What structure allows water flow into the last three gill pouches?
Mouth
What is Ram ventilation?
What is the issue with this kind of ventilation?
Organism must swim continuously with mouth open.
It requires a lot of energy
What kind of ventilation is used by most organisms?
Suction/Force pump
What is the suction pump responsible for?
Inspiration (negative pressure)
What is the force pump responsible for?
Expiration (positive pressure)
How does the suction pump function?
mouth > spiracle open > gill flaps shut + pharynx expands
How does the force pump function?
close lower jaw > gill flaps open > pharynx compresses
What are new modifications of the bony fish?
No spiracle
Gain operculum + chamber
Interbranchial septa are short
What is an advantage of interbranchial septa being shortened?
There is more surface area exposed to the water
What kind of ventilation do bony fish use?
Suction/force pump
What is the advantage of suction/pump ventilation?
There is continuous flow of fresh water