Exam 44: Osmoregulation and Excretion

Use the following figure to answer the question. In which of the labeled structures does passive water reabsorption take place?

Use the following figure to answer the question. The structure labeled ________ can be influenced by hormones to change the concentration of the urine.

African lungfish, which are often found in small, stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation?

The fluid with the highest osmolarity is ________.