, Urodilatin (a natriuretic peptide) inhibits sodium and water reabsorption from the
medullary part of collecting duct, thereby producing diuresis. It is not involved in the
actions described by the other options.
Question 3
pts
What is the direct action of atrial natriuretic hormone?
Sodium retention
Correct!
Sodium excretion
Water retention
Water excretion
Atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) inhibit the secretion
of renin, inhibit angiotensin-induced secretion of aldosterone, vasodilate the afferent
and constrict the efferent glomerular arterioles, and inhibit sodium and water absorption
by kidney tubules. The other actions are not a result of the atrial natriuretic hormone.
Question 4
pts
Which statement best describes a Schilling test?
Correct!
Administration of radioactive cobalamin and the measurement of its excretion in the
urine to test for vitamin B deficiency
12
Measurement of antigen-antibody immune complexes in the blood to test for hemolytic
anemia
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