ATI RN
Endocrine System MCQ Questions Questions
Question 1 of 5
Which of the following does not act as a second messenger in second-messenger systems of hormone action?
Correct Answer: B
Rationale: Failed to generate a rationale of 500+ characters after 5 retries.
Question 2 of 5
Most endocrine secretions are controlled by _____.
Correct Answer: B
Rationale: Step 1: Negative feedback is the primary mechanism in endocrine system regulation to maintain homeostasis. Step 2: When hormone levels reach a certain set point, negative feedback signals the gland to stop producing that hormone. Step 3: This ensures that hormone levels remain within a specific range. Step 4: Positive feedback would lead to further hormone secretion, disrupting homeostasis. Step 5: Neural feedback is not a common mechanism for regulating endocrine secretions.
Question 3 of 5
Identify a gland that is controlled by an anterior pituitary hormone.
Correct Answer: D
Rationale: The correct answer is D: ovary. The anterior pituitary gland secretes follicle-stimulating hormone (FSH) and luteinizing hormone (LH) that regulate the function of the ovaries. FSH stimulates the growth of ovarian follicles, while LH triggers ovulation and stimulates the production of progesterone and estrogen. The pancreas (A) is mainly controlled by insulin and glucagon from the pancreas itself. The parathyroid gland (B) is regulated by parathyroid hormone (PTH) secreted by the parathyroid glands. The adrenal medulla (C) is controlled by the sympathetic nervous system, not by anterior pituitary hormones.
Question 4 of 5
Which of the following is NOT true of parathyroid hormone action?
Correct Answer: B
Rationale: The correct answer is B because parathyroid hormone (PTH) actually increases blood calcium levels. PTH achieves this by releasing calcium from bone (A), promoting reabsorption of calcium in the kidneys (C), and activating Vitamin D for increased calcium absorption in the intestines (D). By decreasing blood calcium levels, it would go against the primary function of PTH. This choice is incorrect as PTH is known for its role in increasing blood calcium levels through the mentioned mechanisms.
Question 5 of 5
Which of the following is NOT an action of insulin?
Correct Answer: C
Rationale: Rationale: C is correct because insulin does not stimulate the breakdown of glycogen. Insulin promotes the storage of glucose as glycogen, not its breakdown. A, B, and D are incorrect because insulin does stimulate cellular absorption of glucose, usage of glucose for energy, and lowers blood glucose levels, respectively. Insulin's main role is to facilitate the uptake and storage of glucose, not its breakdown.