ATI LPN
ATI The Medical Surgical Endocrine Test Questions
Question 1 of 5
The thymus increases in size with aging.
Correct Answer: B
Rationale: The thymus shrinks with age, reducing immune function.
Question 2 of 5
Hormone release stops when the stimulus that triggered it - like thirst or high blood sugar is satisfied or corrected. This is called:
Correct Answer: B
Rationale: Negative feedback systems halt hormone release when the initiating stimulus is resolved, maintaining homeostasis, e.g., insulin secretion stops when blood sugar normalizes.
Question 3 of 5
A 61-year-old woman with hyperthyroidism is treated with propylthiouracil. The drug reduces the synthesis of thyroid hormones because it inhibits oxidation of
Correct Answer: D
Rationale: For iodide (I-) to be 'organified' (incorporated into thyroid hormone), it must be oxidized to I2, which is accomplished by a peroxidase enzyme in the thyroid follicular cell membrane. Propylthiouracil inhibits peroxidase and, therefore, halts the synthesis of thyroid hormones.
Question 4 of 5
Tropic hormones
Correct Answer: C
Rationale: Tropic hormones (e.g., TSH, ACTH) regulate other endocrine glands' secretions.
Question 5 of 5
Which hormones use second-messenger systems?
Correct Answer: B
Rationale: Catecholamines (e.g., epinephrine) use second messengers like cAMP.