Question 1

Which of the following best describes a key difference between the endocrine and nervous systems in how they control body functions?

Accepted Answer

The endocrine system releases hormones into the bloodstream for widespread, long-lasting effects, while the nervous system uses neurotransmitters for localized, rapid responses.

Question 2

A patient presents with excessive thirst and large volumes of dilute urine. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which condition is most likely responsible for these symptoms?

Accepted Answer

Diabetes insipidus

Question 3

Which of the following best explains the mechanism of action for hydrophilic hormones?

Accepted Answer

They bind to cell surface receptors and activate second messenger systems such as $$cAMP$$, leading to a cascade of intracellular events.

Question 4

Which hormone is released from the anterior pituitary in response to corticotropin-releasing hormone (CRH) from the hypothalamus, and what is its primary target?

Accepted Answer

Adrenocorticotropic hormone (ACTH); adrenal cortex

Question 5

A patient with Hashimoto disease is likely to experience which of the following symptoms due to the underlying pathophysiology?

Accepted Answer

Decreased metabolic rate, weight gain, and cold intolerance

Question 6

Which of the following best describes the role of negative feedback in the regulation of thyroid hormone levels?

Accepted Answer

High levels of thyroid hormone inhibit the release of TRH from the hypothalamus and TSH from the anterior pituitary.

Question 7

Which of the following is a correct pairing of hormone and its effect?

Accepted Answer

Aldosterone – increases sodium reabsorption in the kidneys

Question 8

A patient with Cushing disease is likely to exhibit which of the following clinical features?

Accepted Answer

Hyperglycemia, muscle wasting, and hypertension

Question 9

Which of the following best describes the relationship between the adrenal medulla and the sympathetic nervous system?

Accepted Answer

The adrenal medulla acts as a modified sympathetic ganglion, releasing epinephrine and norepinephrine into the bloodstream during stress.

Question 10

Which of the following scenarios best illustrates a synergistic hormone interaction?

Accepted Answer

Thyroid hormone and growth hormone together promote normal growth and development.

Question 11

A child presents with stunted growth and delayed development due to insufficient growth hormone during childhood. Which condition does this describe?

Accepted Answer

Dwarfism

Question 12

Which of the following best explains how insulin and glucagon maintain blood glucose homeostasis?

Accepted Answer

Insulin decreases blood glucose by promoting glucose uptake into cells, while glucagon increases blood glucose by stimulating glycogen breakdown.

Question 13

Which of the following is a correct description of the role of vitamin D in parathyroid hormone (PTH) function?

Accepted Answer

Vitamin D enhances the effect of PTH by increasing calcium absorption in the intestines.

Question 14

A patient with Graves disease is likely to have which of the following laboratory findings?

Accepted Answer

High thyroid hormone levels and low TSH

Question 15

Which of the following best describes the effect of up-regulation of hormone receptors?

Accepted Answer

An increase in the number of receptors on the target cell, making the cell more sensitive to the hormone.

Question 16

Which of the following is a likely consequence of hyposecretion of parathyroid hormone (PTH)?

Accepted Answer

Tetany and muscle spasms due to hypocalcemia

Question 17

Which of the following best describes the first and second messenger system used by some hormones?

Accepted Answer

The hormone acts as the first messenger, binding to a cell surface receptor and triggering the production of a second messenger such as $$cAMP$$ inside the cell.

Question 18

A patient with Addison disease is likely to experience which of the following symptoms?

Accepted Answer

Hypotension, hypoglycemia, and fatigue

Question 19

Which of the following best describes the role of iodine in thyroid hormone synthesis?

Accepted Answer

Iodine is an essential component of the thyroid hormones $$T_3$$ and $$T_4.$$

Question 20

A patient with type 1 diabetes mellitus is most likely to have which of the following underlying causes?

Accepted Answer

Autoimmune destruction of pancreatic beta cells

The Endocrine System: Structure, Function, and Regulation

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