The functional units of kidneys are __________.

Which excretory system contains structures called flame bulbs that function in filtration?

Which of the following is filtered from blood but not normally found in urine?

The filtrate formed by the nephrons in the kidney is not urine. The filtrate is first refined and concentrated by the processes of __________, which form the urine that leaves the body.

Which of the following is the most accurate and comprehensive description of the function of kidneys?

Which of the following is a tube that carries urine from the kidneys to the urinary bladder in a mammal?

Unlike an earthworm's metanephridia, a mammalian nephrona. is intimately associated with a capillary network.b. functions in both osmoregulation and excretion.c. receives filtrate from blood instead of coelomic fluid.d. has a transport epithelium.

Complete this map, which presents the three main topics of this chapter.

Which of the following statements regarding fishes that live in fresh water is/are correct? Select True or False for each statement.T/F Water moves across the gills via osmosis until equilibrium is established, at which time the water molecules stop moving.T/F They lose water to their environment primarily through the gills. They replace this water by drinking.T/F Water enters epithelial cells in their gills via osmosis. Electrolytes leave the same cells via diffusion.T/F They have specialized epithelia that actively pump electrolytes from the environment into the blood.