Blood levels of which of the following substances is decreased in Graves disease?

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Medical Surgical Endocrine Practice Quiz Questions

Question 1 of 5

Blood levels of which of the following substances is decreased in Graves disease?

Correct Answer: D

Rationale: In Graves disease (hyperthyroidism), the thyroid is stimulated to produce and secrete vast quantities of thyroid hormones as a result of stimulation by thyroid-stimulating immunoglobulins (antibodies to the thyroid-stimulating hormone [TSH] receptors on the thyroid gland). Because of the high circulating levels of thyroid hormones, anterior pituitary secretion of TSH will be turned off (negative feedback).

Question 2 of 5

Peptide hormones

Correct Answer: B

Rationale: Peptide hormones are water-soluble and circulate mostly unbound.

Question 3 of 5

The effective plasma concentration of a hormone is normally regulated by appropriate adjustments in the hormone's rate of

Correct Answer: D

Rationale: Secretion rate is the primary regulatory mechanism for plasma hormone levels.

Question 4 of 5

Too little activity of a particular hormone can arise from

Correct Answer: D

Rationale: All listed factors can reduce hormone activity (e.g., gland failure, receptor defects).

Question 5 of 5

Select the incorrect association.

Correct Answer: A

Rationale: Vasopressin is from the posterior pituitary, not adrenal medulla.

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