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Set 9 3 The Thyroid Gland

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Question 1

(Multiple Choice)

Free
Iodine enters follicular cells

A) By primary active transport
B) By secondary active transport using Na+ to drive uphill transport
C) Passively
D) Bound to tyrosine
E) Bound to thyronine

Answer

Question 2

(Multiple Choice)

Free
The main active form of thyroid hormone in the tissues is

A) T3
B) T4
C) Reverse T3
D) DIT
E) MIT

Answer

Question 3

(Multiple Choice)

Free
A patient has low levels of T3 and T4. You test for TSH and find it is elevated. You conclude that

A) Iodine deficiency is the cause of low T3 and T4 levels
B) End-organ unresponsiveness to TSH caused the low T3 and T4 levels
C) The patient has normal hypothalamic-pituitary function
D) The thyroid gland can’t concentrate iodine
E) The problem lies in organification of the thyroglobulin

Answer