The Medical College - Page 46
Passage I (Questions 143–151)
The pituitary gland is responsible for the
secretion of
thyroid stimulating hormone (TSH), which elicits
an
increased production of thyroid hormone from
the
gland; this thyroid hormone then may inhibit the
pitu-
itary via a negative feedback. Under
hyperthyroid con-
ditions, the following tests would give elevated
values:
1. Basal metabolic rate (BMR)
2. Protein bound iodine (PBI)
3. Radioactive iodine uptake (RAI)
143.
When TSH secretion falls, the secretion by
the
thyroid of thyroid hormone:
A.
stays the same.
B.
increases.
C.
decreases.
D.
will feed back upon the pituitary.
144.
According to the schema given, if a normal
indi-
vidual is given an injection of TSH, his/her
thy-
roid hormone production will first
A.
show no noticeable change.
B.
increase.
C.
decrease.
D.
lead to a decrease in pituitary TSH
output.
Use the information in the flow chart and
paragraph
above, and in the following charts, to answer
questions
145–147.
145.
In which of the graphs is there evidence of
thy-
roid malfunction?
A.
I
C.
I and III
B.
I and II
D.
III
146.
Which graph(s) probably represent(s) the case
of
a typical hyperthyroid person?
A.
II
C.
I and III
B.
I
D.
II and III
BIOLOGICAL SCIENCES
10 PROBLEM SETS
OF 5–10 QUESTIONS EACH
15 PROBLEMS FOLLOWED
BY A SINGLE QUESTION
77 QUESTIONS
100 MINUTES
DIRECTIONS:
The following questions or incomplete
statements are in groups. Preceding each series of
questions or statements is a paragraph or a
short explanatory statement, a formula or set of
formulas, or a definition. Read the written
material and then answer the questions or com-
plete the statements. Select the ONE BEST
ANSWER for each question and indicate your
selection by marking the corresponding letter
of your choice on the Answer Form. Elim-
inate those alternatives you know to be
incorrect and then select an answer from among
the remaining alternatives.
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