Tissues of sharks are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes. What can you infer about the movement of sodium and chlorid

A) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium and chloride from seawater.
B) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient.
C) Sharks conserve sodium and chloride, limiting excretion.
D) Sodium and chloride must be eliminated through the gills.


Answer: B

Biology & Microbiology

You might also like to view...

Methanogens can live only in ________ environments.

A. microaerophilic B. aerobic C. anaerobic D. All of the choices are correct.

Biology & Microbiology

Referring to the above diagram of the brain, D identifies which region?

a. hypothalamus b. pons c. cerebrum d. cerebellum e. thalamus

Biology & Microbiology

Which of the following requires oxygen to

function? a. aerobic respiration b. anaerobic respiration c. alcoholic fermentation d. lactate fermentation e. all require oxygen

Biology & Microbiology

Some restriction endonucleases are capable of producing blunt ends; others can generate "sticky" ends

Indicate whether the statement is true or false

Biology & Microbiology