Gills Serve Multiple Functions in Fish in Addition to Gas

question 17

Multiple Choice

Gills serve multiple functions in fish in addition to gas exchange.Given the large surface area of gills with lamellae,what is the most likely explanation for why crucian carp cover protruding lamellae in their gills when levels of oxygen are normal?

• A)to prevent loss of heat to the surrounding water
• B)to prevent loss of ions to the surrounding water
• C)to prevent protein loss to the surrounding water
• D)to prevent loss of oxygen to the surrounding water

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Definitions:

Actin Filaments

Thin filaments in muscle cells and other cell types that, along with myosin, contribute to cell movement and shape changes.

EMG

Electromyography, a diagnostic procedure to assess the health of muscles and the nerve cells that control them.

Electrodes

Conductor materials used to establish electrical contact with a nonmetallic part of a circuit, often used in medical and scientific equipment.

Skeletal Muscle Fibers

Long, cylindrical cells that make up skeletal muscles, responsible for voluntary movements through contraction.