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When ________ and _________ are broken down excess nitrogen is released that must be eliminated by the excretory system.


A) amino acids & nucleic acids
B) proteins & salts
C) glucose & fatty acids
D) nucleic acids & sulfur

E) A) and B)
F) A) and C)

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The main nitrogenous waste excreted by terrestrial amphibians and mammals is


A) urea.
B) uric acid.
C) amino acid.
D) ammonia.
E) uracil.

F) A) and B)
G) All of the above

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Normally,concentrations of metabolically important substances,such as glucose,are


A) high in glomerular filtrate but only a trace in urine.
B) low in glomerular filtrate but high in urine.
C) high in glomerular filtrate and urine.
D) low in both glomerular filtrate and urine.
E) excluded from entering the excretory system altogether.

F) A) and B)
G) A) and C)

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Nephridia are the paired structures used in excretion in


A) earthworms.
B) insects.
C) humans.
D) planarians.

E) None of the above
F) A) and D)

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Which hormone from the adrenal cortex of the kidneys will cause the distal convoluted tubules to reabsorb more sodium ions?


A) renin
B) angiotensinogen
C) angiotensin II
D) ADH
E) aldosterone

F) A) and E)
G) B) and D)

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The kidney was one of the first organs to be successfully transplanted because it is so encapsulated and has limited vessels feeding into or out of it.How many major "connections" must be cut in transplant surgery for one kidney?


A) two: the renal artery and vein
B) three: the renal artery and vein and the urethra
C) three: the renal artery and vein and the ureter
D) four: the renal artery and vein,the ureter,and urethra
E) five: the renal artery and vein,two ureters,and one urethra

F) B) and C)
G) A) and E)

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Albumin is the large protein molecule found in egg white and blood plasma.Table salt dissociates into sodium and chloride ions.Urea is assembled in the liver.In a healthy person,what is the fate of the majority of these molecules as they pass through a nephron?


A) All three remain in the bloodstream.
B) All three move into the glomerular capsule and are excreted in urine.
C) All three move into the glomerular capsule but the salt ions are mostly reabsorbed.
D) Albumin remains in the blood and salt ions and urea moved into the glomerular filtrate and excreted in the urine.
E) Albumin remains in the blood,salt ions move into the filtrate but most are reabsorbed,and the urea moves into the filtrate and is excreted in the urine.

F) B) and D)
G) C) and D)

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