Fish gas exchange Flashcards
How does volume change in the fish?
The mouth opens (operculum is closed), the buccal cavity floor is lowered which increases the volume
What happens when the volume increases?
The pressure of the buccal cavity decreases compared to the outside
What is the result of the volume and pressure change?
Water rushes into the mouth down a pressure gradient
What happens when water enters the mouth?
The operculum cavity expands and the buccal cavity floor is raised
How does water moving into the mouth effect the pressure?
The pressure inside the buccal cavity is higher than in the opercular cavity
How does the increase in pressure increase move the water?
The water moves from buccal cavity over the gills into the opercular cavity so the mouth is closed and operculum opens
How does the pressure with water in the mouth increase?
The sides of the opercular cavity moves inwards, increasing pressure
What dos the increase of pressure inside the opercular cavity result in?
Water rushes out of the fish through the operculum
What is concurrent direction?
Water and blood go in the same direction
What is countercurrent direction?
Water and blood going in opposite directions
What is the effect of the gill exchange system?
The countercurrent exchange system maintains a steep concentration gradient
