Question 1

Which of the following best describes the anatomical location and histological organization of the thyroid gland?

Accepted Answer

It is located inferior to the larynx, consists of follicles filled with colloid, and is surrounded by a connective tissue capsule.

Question 2

A patient presents with symptoms of hyperthyroidism. Which hormone is most likely elevated, and what is its primary action?

Accepted Answer

Triiodothyronine (T3); it increases basal metabolic rate and stimulates protein synthesis.

Question 3

Which dietary factor is essential for thyroid hormone synthesis, and what is its role in the process?

Accepted Answer

Iodine; it is incorporated into tyrosine residues on thyroglobulin to form T3 and T4.

Question 4

Which of the following best explains the mechanism by which the hypothalamus regulates hormone release from the anterior pituitary?

Accepted Answer

The hypothalamus secretes releasing and inhibiting hormones into the hypophyseal portal system, which directly affect anterior pituitary cells.

Question 5

A patient has a tumor destroying the zona glomerulosa of the adrenal cortex. Which hormone would be most affected, and what is a likely physiological consequence?

Accepted Answer

Aldosterone; impaired sodium retention and possible hypotension.

Question 6

Which hormone is produced by the pineal gland, and what is its primary function?

Accepted Answer

Melatonin; regulation of circadian rhythms and sleep-wake cycles.

Question 7

Which of the following best describes the relationship between insulin and glucagon secreted by the pancreas?

Accepted Answer

They have antagonistic effects: insulin lowers blood glucose, while glucagon raises it.

Question 8

A patient is diagnosed with diabetes insipidus. Which hormone is deficient, and what is the primary symptom?

Accepted Answer

Antidiuretic hormone (ADH); excessive urination and dehydration.

Question 9

Which hormone is tested for in the urine during a home pregnancy test, and what is its source?

Accepted Answer

Human chorionic gonadotropin (hCG); produced by the placenta.

Question 10

Which of the following is an example of paracrine signaling?

Accepted Answer

A cell releases a chemical messenger that acts on neighboring cells within the same tissue.

Question 11

Which of the following best describes the cAMP second messenger pathway?

Accepted Answer

A hormone binds to a G protein-coupled receptor, activating adenylate cyclase, which converts ATP to cAMP, leading to activation of protein kinase A.

Question 12

Which of the following is a correct equation for the conversion of ATP to cAMP in the cAMP second messenger system?

Accepted Answer

$\mathrm{ATP} \xrightarrow{	ext{adenylate cyclase}} \mathrm{cAMP} + \mathrm{PP_i}$

Question 13

A patient with hypoparathyroidism would most likely exhibit which of the following symptoms, and why?

Accepted Answer

Muscle spasms due to decreased blood calcium levels.

Question 14

Which of the following best describes the function of aldosterone?

Accepted Answer

It increases sodium reabsorption and potassium excretion in the kidneys.

Question 15

Which hormone is secreted by the adrenal medulla, and what is its effect on the body during stress?

Accepted Answer

Epinephrine; increases heart rate, blood pressure, and blood glucose.

Question 16

Which of the following is a correct example of negative feedback regulation in the endocrine system?

Accepted Answer

Elevated blood cortisol inhibits release of corticotropin-releasing hormone (CRH) from the hypothalamus.

Question 17

Which of the following best describes the difference between the anterior and posterior pituitary lobes?

Accepted Answer

The anterior pituitary synthesizes and secretes its own hormones, while the posterior pituitary stores and releases hormones produced by the hypothalamus.

Question 18

A patient with Addison's disease has insufficient production of adrenal cortex hormones. Which of the following symptoms would you expect?

Accepted Answer

Hyponatremia, hypotension, and hyperpigmentation.

Question 19

Which of the following hormones is classified as a steroid hormone?

Accepted Answer

Cortisol

Endocrine System and Blood: Structured Study Guide for Anatomy & Physiology

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