If a Ray-Finned Fish Is to Both Hover (Remain Stationary)

question 49

Multiple Choice

If a ray-finned fish is to both hover (remain stationary) in the water column and ventilate its gills effectively, then what other structure besides its swim bladder will it use?

• A) its pectoral fins
• B) its lateral line system
• C) its caudal (tail) fin
• D) its operculum

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Definitions:

Pulmonary Artery

The blood vessel that carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.

Urinary Bladder

A hollow organ in the lower abdomen that stores urine from the kidneys before it is excreted.

Dysrhythmia

An abnormality in the heart rhythm, which can range from minor irregularities to severe disturbances in heart function.

Apical Pulse

The pulse rate measured at the apex of the heart, typically listened to with a stethoscope for assessing heart function.