What is the total cost of using the heater for 15 minutes?

Correct Answer: B

Rationale: To calculate the total cost of using the heater for 15 minutes, we need to consider the cost per minute. If the cost is $0.01 per minute, then for 15 minutes, it would be 15 * $0.01 = $0.15. Therefore, the correct answer is B. Option A ($0.04) is incorrect because it is too low for 15 minutes of usage. Option C ($2.40) and Option D ($9.00) are incorrect because they are too high for the given time frame.

Correct Answer: D

Rationale: The correct answer is D: peroxidase enzymes. Peroxidase enzymes are responsible for catalyzing the iodination process of thyroid hormones in the thyroid gland. They facilitate the incorporation of iodine atoms into tyrosine residues within thyroglobulin to form thyroid hormones T3 and T4. Lysosomes (choice A) are involved in cellular waste disposal, not iodination. The Golgi apparatus (choice B) is responsible for processing and packaging proteins, not iodination. Colloid endocytosis (choice C) is the process of internalizing colloid-containing vesicles in thyroid follicular cells, but it is not directly involved in iodination.

Correct Answer: D

Rationale: The correct answer is D: Splenic vein. The splenic vein lies posterior to the body of the pancreas. Step 1: Locate the pancreas in the abdominal cavity. Step 2: Identify the structures behind the body of the pancreas. Step 3: The splenic vein runs posterior to the body of the pancreas, making it the correct answer. Other choices are incorrect because A: IVC is located more inferiorly, B: Portal vein is located more superiorly, and C: Common bile duct is located more anteriorly to the body of the pancreas.

Correct Answer: a

Rationale: The correct answer is A: Calcitonin-parathyroid hormone. 1. Calcitonin lowers blood calcium levels by inhibiting bone breakdown, while parathyroid hormone raises blood calcium levels by stimulating bone breakdown. 2. This hormone pair directly opposes each other in regulating blood calcium levels. 3. Choices B, C, and D do not involve hormones with antagonistic effects on the same physiological process.

Correct Answer: C

Rationale: Step-by-step rationale for why choice C is correct: 1. The adrenal medulla is part of the adrenal glands. 2. It secretes adrenaline and noradrenaline during the fight-or-flight response. 3. These hormones increase heart rate, blood flow to muscles, and provide energy for emergencies. 4. This physiological response helps the body deal with stressful situations. 5. Choices A, B, and D are incorrect because the adrenal medulla is not primarily controlled by ACTH, does not secrete steroids, and does not secrete iodine-containing hormones.