Multiple Choice Questions Endocrine System

Multiple Choice Questions Endocrine System Related

Review Multiple Choice Questions Endocrine System related questions and content

Which hormone is involved in the regulation of calcium levels in the blood?

  • A. parathyroid hormone
  • B. aldosterone
  • C. calcitonin
  • D. thyroid hormone
Correct Answer: A

Rationale: The correct answer is A: parathyroid hormone. Parathyroid hormone is responsible for regulating calcium levels in the blood by increasing calcium release from bones, enhancing calcium absorption in the intestines, and promoting calcium reabsorption in the kidneys. This hormone acts to elevate blood calcium levels when they are low.

B: Aldosterone is a hormone that regulates sodium and potassium levels, not calcium.

C: Calcitonin is involved in lowering blood calcium levels by inhibiting the breakdown of bone tissue, but it is not the primary hormone responsible for regulating calcium levels in the blood.

D: Thyroid hormone plays a role in metabolism regulation, growth, and development, but it is not directly involved in the regulation of calcium levels in the blood.

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T3, T4, and calcitonin are:

  • A. secreted by the thyroid gland.
  • B. secreted by the parathyroid glands.
  • C. secreted in response to declining plasma levels of calcium.
  • D. steroids.
Correct Answer: A

Rationale: Rationale:
1. T3, T4, and calcitonin are hormones secreted by the thyroid gland.
2. Thyroid gland is responsible for producing and releasing these hormones.
3. T3 and T4 regulate metabolism, while calcitonin helps regulate calcium levels.
4. Parathyroid glands secrete parathyroid hormone, not T3, T4, or calcitonin.
5. These hormones are not secreted in response to declining plasma levels of calcium.
6. T3, T4, and calcitonin are not steroids, they are peptide hormones.
Therefore, the correct answer is A.

What is the formula of aluminium sulfate?

  • A. Al2(SO4)3
  • B. Al2(SO3)4
  • C. Al4(SO4)2
  • D. Al4(SO3)2
Correct Answer: A

Rationale: The correct formula for aluminium sulfate is Al2(SO4)3. This is because aluminium has a 3+ charge while sulfate has a 2- charge, requiring two aluminium ions to balance three sulfate ions. Choice B (Al2(SO3)4) is incorrect because sulfate ions have a 2- charge, not sulfite ions (SO3). Choices C (Al4(SO4)2) and D (Al4(SO3)2) have incorrect subscripts for the elements, not following the correct charge balance.

Complete the following sentence: Hormones are chemical messengers that…

  • A. Remain at a constant concentration in the blood
  • B. Are synthesised by plasma proteins
  • C. Are only produced after puberty
  • D. Alter the activity of target tissues
Correct Answer: D

Rationale: The correct answer is D because hormones alter the activity of target tissues to regulate various physiological processes in the body. Hormones act on specific receptors in target tissues to initiate a response. Option A is incorrect because hormone levels fluctuate to maintain homeostasis. Option B is incorrect because hormones are typically synthesized by endocrine glands, not plasma proteins. Option C is incorrect because hormones are produced throughout life, not just after puberty.

The main mineralocorticoid produced by the adrenal cortex is _____.

  • A. cortisol.
  • B. glucagon.
  • C. epinephrine.
  • D. aldosterone.
Correct Answer: D

Rationale: The correct answer is D: aldosterone. Aldosterone is the main mineralocorticoid produced by the adrenal cortex, responsible for regulating electrolyte balance and blood pressure. It acts on the kidneys to increase sodium reabsorption and potassium excretion. Cortisol (A) is a glucocorticoid, not a mineralocorticoid. Glucagon (B) is a hormone produced by the pancreas that raises blood glucose levels. Epinephrine (C) is a hormone produced by the adrenal medulla involved in the fight-or-flight response, not a mineralocorticoid. Therefore, the correct answer is aldosterone (D) due to its specific role in mineral balance regulation.

What is the density of the block and does it float or sink in the liquid?

  • A. 0.50, floats
  • B. 0.50, sinks
  • C. 2.0, floats
  • D. 2.0, sinks
Correct Answer: D

Rationale: The correct answer is D: 2.0, sinks. Density is calculated by mass/volume. If the density of the block is 2.0, it means it is denser than the liquid (density of water is around 1.0), so it will sink. If the density was 0.50, it would be less dense than the liquid and float, making choices A and C incorrect. Choice B is also incorrect as a block with a density of 0.50 would float.

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