,Administration of folate and measurement in 2 hours of its level in a blood sample to
test for folic acid deficiency anemia.
The Schilling test indirectly evaluates vitamin B12 absorption by administering radioactive
B12 and measuring excretion in the urine. This selection is the only option that accurately
describes a Schilling test.
Question 5
pts
Hemolytic disease of the newborn (HDN) can occur if the mother:
Is Rh-positive and the fetus is Rh-negative
Correct!
Is Rh-negative and the fetus is Rh-positive
Has type A blood and the fetus has type O
Has type AB blood and the fetus has type B
HDN can occur only if antigens on fetal erythrocytes differ from antigens on maternal
erythrocytes. Maternal-fetal incompatibility exists only if the mother and fetus differ in
ABO blood type or if the fetus is Rh-positive and the mother is Rh-negative. This
erythrocyte incompatibility does not exist in any of the other options.
Question 6
pts
Which T-lymphocyte phenotype is the key determinant of childhood asthma?
Cluster of differentiation (CD) 4 T-helper Th1 lymphocytes
Correct!
CD4 T-helper Th2 lymphocytes
CD8 cytotoxic T lymphocytes
, Memory T lymphocytes
Asthma develops because the Th2 response (in which CD4 T-helper cells produce
specific cytokines, such as interleukin [IL]–4, IL-5, and IL-13) promotes an atopic and
allergic response in the airways. This selection is the only option that accurately
identifies the appropriate T-lymphocyte phenotype.
Question 7
pts
Perceived stress elicits an emotional, anticipatory response that begins where?
Prefrontal cortex
Anterior pituitary
Correct!
Limbic system
Hypothalamus
Perceived stressors elicit an anticipatory response that begins in the limbic system of
the brain, the only option responsible for emotions and cognition.
Question 8
pts
Hypersensitivity is best defined as a(an):
Disturbance in the immunologic tolerance of self-antigens
Immunologic reaction of one person to the tissue of another person
Correct!
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