3.1.1: Gas Exchange In Fish Flashcards
What is the function of the buccal cavity in fish ventilation?
The buccal cavity increases in volume and decreases pressure, allowing water to flow in
The buccal cavity plays a crucial role in the process of ventilation by facilitating water intake.
What happens when the operculum valve closes?
The operculum cavity expands, decreasing pressure and allowing water to flow over the gills
This is part of the ventilation process in fish.
How do fish ensure a constant flow of water over their gills?
By closing their mouth and opening the operculum, increasing pressure to force water out
This mechanism is essential for gas exchange in fish.
What are gill filaments and gill lamellae?
Gill filaments are thin structures that support gill lamellae, which are stacked plates
Both structures increase the surface area for gas exchange.
What is the role of the capillary network in gill lamellae?
It provides a short diffusion distance for gas exchange
This network is vital for efficient oxygen and carbon dioxide exchange.
Fill in the blank: Fish have _____ layers of gills on both sides of their heads.
four
True or False: The gills in fish are primarily composed of thick tissue to enhance protection.
False
Gills are made of thin structures to facilitate gas exchange.
What is the sequence of actions for fish ventilation?
- Mouth opens
- Buccal cavity lowers
- Operculum valve closes
- Water flows over gills
- Mouth closes, operculum opens
What increases the surface area of the gills in fish?
The arrangement of gill filaments and gill lamellae stacked at right angles
This arrangement maximizes the area available for gas exchange.
What is the significance of the thin structure of gill filaments?
It minimizes diffusion distance for gases
This is crucial for efficient gas exchange between water and blood.
What does the term ‘ventilation’ refer to in the context of fish?
The process of water flowing over the gills for gas exchange
Ventilation is essential for fish to obtain oxygen from water.
