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- 1. Multiple Choice
Which organs of a bony fish allow oxygen to be exchanged between the fish’s blood and the surroundings?
Lungs
Gills
Fins
Trachea
- 2. Multiple Choice
Which of the following is a defining aspect of the countercurrent exchange principle?
The blood in the capillaries of the lamellae flows in the same direction as the water passing over the lamellae
The oxygenated and deoxygenated blood in the capillaries of the lamellae mix and flow in the same direction
The blood in the capillaries of the lamellae flows in the opposite direction to the water passing over the lamellae
- 3. Multiple Choice
What is the primary purpose of the countercurrent exchange system in fish?
To streamline the gills and enable efficient swimming
To increase the surface area of the gills
To maintain a high oxygen concentration gradient
To remove waste products, like urea
To Shorten the diffusion pathway
- 4. Multiple Choice
Which of the following Graphs correctly demonstrates the countercurrent flow of water and blood in fish gills?
- 5. Multiple Choice
The diagam shows a simplified outline of fish' respiratory system.
Which of the following structures are indicated by X?
Spiracles
Alveoli
Gill Tracheoles
Gill Filaments
- 6. Multiple Choice
The diagram shows a close-up view of a stack of gill filaments.
which of the following structures are indicate by X
Tracheoles
Bronchi
Alveoli
Spiracles
Lamellae
- 7. Multiple Choice
Which of the following correctly describes the general structure of fish gills?
The gill lamellae are long tubes that connect to the surface of the body which directly supply the tissues with oxygenated water
The gill filaments are arranged in stacks, and each gill filament has multiple gill lamellae projected from its surface
The gill filaments are arranged in long tubes which branch off into gill lamellae that supply the tissues with blood
The gill lamellae are arranged in layers, and each gill lamella has multiple gill filament projected from its surface
- 8. Multiple Choice
The graph compares gill surface area and body weight for various different species of fish (indicated by different circles).
what is the trend shown?
Suggest why we see this trend.
As body mass increases, the surface area of the gill increases
As body mass increases, the surface area of the gill decreases
As body mass increases, there is no significant change in the surface area of the gills
The surface area of the gills has no relation to body mass, as this is determined by nutrition and available space
A larger body mass requires more gas exchange to take place to provide all the cells with the required oxygen
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