What role does Na+/K+-ATPase play in salt excretion by the shark rectal gland?
Na+/K+-ATPase produces an electrochemical gradient to transport sodium ions out of the blood.
Na+/K+-ATPase produces an electrochemical gradient to transport chloride ions out of the blood.
Na+/K+-ATPase pumps urea into the body tissue of the shark making it hypertonic to the seawater.
Na+/K+-ATPase pumps sodium directly into the lumen of the rectal gland.