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Which artery generally gives rise to inferior thyroid artery?
- A. Arch of aorta
- B. Brachiocephalic artery
- C. External carotid artery
- D. Thyrocervical trunk
Correct Answer: D
Rationale: The correct answer is D, the thyrocervical trunk. This artery generally gives rise to the inferior thyroid artery. The thyrocervical trunk is a branch of the subclavian artery, supplying blood to the thyroid gland. The other choices are incorrect because the arch of aorta does not give rise to the inferior thyroid artery, the brachiocephalic artery does not directly supply the thyroid gland, and the external carotid artery does not typically provide blood to the thyroid gland. Therefore, the thyrocervical trunk is the most likely source for the inferior thyroid artery.
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Hormones that bind to receptors inside of target cells are usually
- A. lipid soluble.
- B. water soluble.
- C. second messengers.
- D. proteins.
Correct Answer: A
Rationale: The correct answer is A: lipid soluble. Lipid-soluble hormones can easily pass through the cell membrane and bind to intracellular receptors. This binding activates gene expression and affects protein synthesis within the cell. Water-soluble hormones, like choice B, bind to cell surface receptors and activate signaling pathways through second messengers (choice C). Proteins (choice D) are not hormones but rather macromolecules that can act as signaling molecules or receptors. Lipid solubility is crucial for hormones to exert their effects inside target cells, making choice A the correct answer.
Twenty-eight-year-old Alicia has recently been diagnosed with hyperthyroidism. Signs and symptoms of hyperthyroidism include:
- A. Tachycardia, sweating, and tremors.
- B. Fatigue, lethargy, and weight gain.
- C. Muscle twitching, tetany, and galactorrhea.
- D. Scotoma, alopecia, and hirsutism.
Correct Answer: A
Rationale: Symptoms of hyperthyroidism include increased heart rate (tachycardia), excessive sweating, and tremors due to the overactive thyroid gland.
A patient with mild iatrogenic Cushing syndrome is on an alternate-day regimen of corticosteroid therapy. What does the nurse explain to the patient about this regimen?
- A. It maintains normal adrenal hormone balance.
- B. It prevents ACTH release from the pituitary gland.
- C. It minimizes hypothalamic-pituitary-adrenal suppression.
- D. It provides a more effective therapeutic effect of the drug.
Correct Answer: C
Rationale: Alternate-day corticosteroid therapy minimizes hypothalamic-pituitary-adrenal axis suppression, which helps prevent long-term adrenal insufficiency.
Which is not a function of the hypothalamus?
- A. Affect heart rate
- B. Control temperature
- C. Affect water balance
- D. Secrete FSH
Correct Answer: D
Rationale: The correct answer is D: Secrete FSH. The hypothalamus produces releasing and inhibiting hormones that regulate the pituitary gland's secretion of hormones such as FSH. The hypothalamus itself does not secrete FSH. A, B, and C are functions of the hypothalamus as it is involved in regulating heart rate, temperature control, and water balance through various hormonal and neural pathways.
Growth hormone ________.
- A. is also called somatostatin
- B. is regulated by humoral mechanisms
- C. secretion results in a decrease in muscle mass
- D. promotes long bone growth during the formative years
Correct Answer: D
Rationale: The correct answer is D because growth hormone promotes long bone growth during the formative years by stimulating the growth plates in bones. This hormone plays a crucial role in skeletal growth and development. Choice A is incorrect because somatostatin is a different hormone that inhibits growth hormone release. Choice B is incorrect because growth hormone is primarily regulated by neural mechanisms. Choice C is incorrect because growth hormone actually promotes muscle growth and reduces fat mass.