Nokea
Which of the following is descriptive of the adrenal cortex?
- A. It is the target gland of ACTH.
- B. It secretes catecholamines.
- C. It secretes hormones that lower blood glucose.
- D. It secretes iodine-containing hormones.
Correct Answer: A
Rationale: Step-by-step rationale for why choice A is correct:
1. The adrenal cortex is indeed the target gland of ACTH (Adrenocorticotropic hormone).
2. ACTH stimulates the adrenal cortex to produce and release corticosteroid hormones.
3. These corticosteroid hormones play crucial roles in regulating metabolism, immune response, and stress response.
4. Therefore, choice A accurately describes the relationship between the adrenal cortex and ACTH.
Summary:
Choice A is correct because the adrenal cortex is the target gland of ACTH, not the other choices. The adrenal medulla secretes catecholamines (choice B), hormones that raise blood glucose (not lower, as in choice C), and iodine-containing hormones are secreted by the thyroid gland, not the adrenal cortex (choice D).
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Simple goiter can be prevented by _________.
- A. antibiotics
- B. adding iodine to the diet
- C. surgery
- D. hormone therapy
Correct Answer: B
Rationale: The correct answer is B: adding iodine to the diet. Iodine deficiency is a common cause of simple goiter. Iodine is essential for the production of thyroid hormones, and a lack of it can lead to the enlargement of the thyroid gland. Adding iodine to the diet helps prevent simple goiter by ensuring the thyroid has enough iodine to function properly. Antibiotics (choice A) are not effective for preventing goiter as it is not caused by bacteria. Surgery (choice C) and hormone therapy (choice D) are typically used to treat goiter once it has developed, not prevent it.
Pro-opiomelanocortin (POMC) is a prohormone for __________.
- A. ACTH
- B. growth hormone
- C. thyroxin
- D. insulin
Correct Answer: A
Rationale: Rationale: POMC is processed into various peptide hormones, including adrenocorticotropic hormone (ACTH). ACTH is produced by the pituitary gland and stimulates the adrenal glands to release cortisol. This is why option A is correct. Growth hormone, thyroxin, and insulin are not derived from POMC, making options B, C, and D incorrect.
Mrs. Klein, aged 35 years, has just been diagnosed as diabetic. She is being put on a 1200 calorie diabetic diet with 50% of the calories to be from carbohydrates, 20% from protein, and 30% from fat. In instructing her about her diet, which of the following would be the best breakfast to suggest?
- A. Three waffles with butter, dietetic syrup, coffee
- B. One boiled egg, corn flakes with one glass milk, coffee, glass of orange juice
- C. A cheese omelet (4 oz cheddar, three eggs), one slice toast, one glass milk
- D. Two buttered English muffins, glass of grapefruit juice, coffee
Correct Answer: C
Rationale: A cheese omelet with protein and appropriate carbohydrate content fits the macronutrient distribution for a diabetic diet.
The endocrine gland(s) referred to as the 'master gland' is the:
- A. pancreas
- B. adrenal glands
- C. thyroid gland
- D. pituitary gland
Correct Answer: D
Rationale: The correct answer is D: pituitary gland. The pituitary gland is often referred to as the 'master gland' because it controls the functions of other endocrine glands in the body. It secretes hormones that regulate various bodily functions such as growth, metabolism, and reproduction. It is located at the base of the brain and is divided into two parts: anterior and posterior. The anterior pituitary gland produces and releases several important hormones that influence other endocrine glands. The other choices (A: pancreas, B: adrenal glands, C: thyroid gland) do not have the same broad regulatory control over the endocrine system as the pituitary gland.
How do hormones from the thyroid and parathyroid regulate the calcium concentration of the blood?
- A. Calcitonin lowers blood calcium; parathyroid hormone raises blood calcium.
- B. Parathyroid hormone lowers blood calcium; calcitonin raises blood calcium.
- C. Thyroxine and triiodothyronine together regulate calcium levels, as needs dictate.
- D. Both parathroid hormone and the three thyroid hormones function to regulate blood calcium levels.
Correct Answer: A
Rationale: Step 1: Calcitonin is secreted by the thyroid gland and lowers blood calcium levels by promoting calcium deposition in bones.
Step 2: Parathyroid hormone (PTH) is secreted by the parathyroid gland and raises blood calcium levels by stimulating bone resorption and increasing calcium reabsorption in the kidneys.
Step 3: Since Calcitonin lowers blood calcium and PTH raises blood calcium, choice A is correct.
Summary: Choices B, C, and D are incorrect as they provide inaccurate information about the roles of calcitonin, PTH, thyroxine, and triiodothyronine in regulating blood calcium levels.