Freshwater Fish Reside in Hypotonic Environments

question 17

Multiple Choice

Freshwater fish reside in hypotonic environments. They do not drink water, and they excrete large volumes of hypotonic urine in an effort to osmoregulate. How do they obtain an adequate supply of electrolytes?

• A) The rectal gland is specialized to produce the dilute (hypotonic) urine and conserve ions.
• B) Chloride cells in the gut transport additional electrolytes into the circulation of these organisms.
• C) Chloride cells on the gill filaments take up additional electrolytes from freshwater.
• D) There is an increase in Na+/K+-ATPase activity across the basolateral membrane.

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