Chapter 76: Thyroid Metabolic Hormones

Chapter 76: Thyroid Metabolic Hormones

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

1. A patient has a goiter associated with high plasma levels of both TRH and TSH. Heart rate is elevated. This patient most likely has which of the following?

1. Endemic goiter
2. A hypothalamic tumor secreting large amounts of TRH

C.     A pituitary tumor secreting large amounts of TSH

1. Graves’ disease
2. A thyroid adenoma

ANS: B

2. A 30-year-old female reports to the clinic for a routine physical examination. The examination reveals that she is pregnant. Plasma levels of TSH are high but total thyroid hormone concentration is normal. Which of the following best reflects this patient’s clinical state?

1. Graves’ disease
2. Hashimoto’s disease

C.     A pituitary tumor secreting TSH

1. A hypothalamic tumor secreting TRH
2. The patient is taking thyroid extract

ANS: __

Answer:  B

3. A patient has the following: elevated [plasma T4], low [plasma TSH], and a thyroid gland size below normal. Which of the following is the most likely explanation for these finding?

1. A lesion of the anterior pituitary that prevents TSH secretion
2. The patient is taking propylthiouracil
3. The patient is taking thyroid extract
4. The patient is consuming large amounts of iodine
5. Graves’ disease

ANS: C

4. A patient has myxedema. Which of the following sets of physiological changes would be expected?

Cardiac output            Plasma [RT₃]               Plasma [cholesterol]

1. ↑                 ↑                 ↑
2. ↑                 ↓                 ↓

C.     ↓                 ↑                 ↓

1. ↓                 ↓                 ↑
2. ↓                 ↓                 ↓

ANS: D