Which organs are considered excretory?
A. Lungs, liver, stomach, kidneys
B. Skin, kidneys, ovaries, lungs
C. Liver, large intestine, kidneys, skin
D. Lungs, large intestine, small intestine, brain
Which of the following is not associated with the production of urine?
A. proximal tubule
B. loop of Henle
C. collecting duct
D. Malpighian tubule
Which of the following is a function of the excretory system?
B. blood maintenance
C. elimination of undigested foods
D. maintenance of water balance
Marine animals that have body fluids with a solute concentration equal to that of the surrounding sea water are:
Birds eliminate nitrogenous waste in the form of?
A. amino acids
D. uric acid
To conserve precious salts, freshwater fish…
A. produce small amounts of urine
B. significantly dilute their urine
C. do not take up water
D. drink through their gills
Which animals are being studied as examples of an adaptation called anhydrobiosis?
B. polar bears
What is the advantage of excreting nitrogenous waste in the form of ammonia?
A. Ammonia is less toxic than uric acid
B. Ammonia is less soluble than uric acid
C. Ammonia excretion conserves energy
D. Ammonia does not diffuse across cell membranes
Which of the following statements regarding saltwater fish is true?
A. The concentration of solutes in the internal fluids of saltwater fish is much lower than the surrounding water
B. Saltwater fish produce large amounts of diluted urine
C. Saltwater fish frequently dilute their body fluids
D. The concentration of solutes in the internal fluids of saltwater fish is higher than in the surrounding environment
Which of the following statements regarding freshwater fish is true?
A. Freshwater fish frequently drink to obtain salt ions
B. Freshwater fish do not produce urine
C. Freshwater fish use their gills to actively take up salt ions
D. Freshwater fish lose water through their gills by osmosis
Which of the following by-products of metabolism is most toxic?
B. Uric acid
D. Carbonic acid
Mammals have evolved a sophisticated mechanism for eliminating nitrogenous waste that involves:
A. secretion through cell membranes
B. forming urea and storing it in concentrated solution
C. producing uric acid and excreting it with feces
D. recycling urea and using it as an energy source
The functional unit of the kidney is the
A. renal unit
C. Bowman’s capsule
Which of the following kinds of animals excrete their nitrogenous waste entirely as ammonia?
B. Tropical insects
Which of the following statements about uric acid is true?
A. Uric acid is more soluble in water than urea
B. The darker material in bird droppings is mostly uric acid
C. Animals that excrete uric acid avoid the problem of dehydration associated with the excretion of urea
D. Uric acid cannot be excreted because of its toxicity
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