Question 1

Which of the following best describes the primary function of the hypothalamus in the endocrine system?

Accepted Answer

It produces hormones that regulate the anterior pituitary gland.

Question 2

A patient presents with abnormally low calcium levels in the blood. Which histological structure is most likely underactive?

Accepted Answer

Chief (principal) cells of the parathyroid gland

Question 3

Which hormone is primarily produced by the zona fasciculata of the adrenal cortex, and what is its main function?

Accepted Answer

Cortisol; regulates metabolism and stress response

Question 4

During a histological examination, you observe spherical structures filled with colloid surrounded by a single layer of cuboidal cells. Which gland and cell type are you most likely observing?

Accepted Answer

Thyroid gland; follicular cells

Question 5

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

Accepted Answer

The anterior lobe (pars distalis) synthesizes and secretes hormones, while the posterior lobe (pars nervosa) releases hormones made in the hypothalamus.

Question 6

A tumor destroys the zona glomerulosa of the adrenal cortex. Which physiological effect is most likely to occur?

Accepted Answer

Decreased production of aldosterone, leading to electrolyte imbalances

Question 7

Which structure is responsible for the production of melatonin, and what is its primary role?

Accepted Answer

Pineal gland; regulation of circadian rhythms

Question 8

In a histological section of the pancreas, which cells are responsible for endocrine function, and what hormone do they primarily secrete?

Accepted Answer

Islets of Langerhans; insulin

Question 9

A patient with an autoimmune disorder has destruction of the thymic medulla, including Hassall’s corpuscles. Which process is most likely impaired?

Accepted Answer

Maturation of T lymphocytes

Question 10

Which of the following best describes the function of parafollicular (C) cells in the thyroid gland?

Accepted Answer

They secrete calcitonin, which lowers blood calcium levels.

Question 11

A patient is diagnosed with Addison’s disease, which involves destruction of the adrenal cortex. Which zones are affected, and what hormones are deficient?

Accepted Answer

Zona glomerulosa, zona fasciculata, and zona reticularis; aldosterone, cortisol, and androgens

Question 12

Which structure connects the hypothalamus to the pituitary gland, and what is its significance?

Accepted Answer

Infundibulum; it allows transport of hormones and nerve fibers between the hypothalamus and pituitary

Question 13

Which of the following best describes the role of the heart as an endocrine organ?

Accepted Answer

It secretes atrial natriuretic peptide (ANP), which decreases blood pressure by increasing sodium excretion.

Question 14

Which cells in the posterior pituitary lobe support the storage and release of hormones, and what are they called?

Accepted Answer

Pituicytes; glial-like support cells

Question 15

A patient has a tumor in the parathyroid gland causing hypersecretion of parathyroid hormone (PTH). Which of the following laboratory findings would you expect?

Accepted Answer

Increased blood calcium levels

Question 16

Which of the following correctly matches the gland with its primary hormone and function?

Accepted Answer

Adrenal medulla; norepinephrine; initiates fight-or-flight response

Question 17

Which of the following best describes the function of the islets of Langerhans in the pancreas?

Accepted Answer

They secrete hormones such as insulin and glucagon to regulate blood glucose.

Question 18

A patient with a thyroidectomy (removal of the thyroid gland) is at risk for which of the following complications due to accidental removal of another gland?

Accepted Answer

Hypocalcemia due to loss of parathyroid glands

Question 19

Which region of the adrenal gland is responsible for androgen production, and what is the name of this region?

Accepted Answer

Zona reticularis; produces androgens

Question 20

Which of the following best describes the function of the thymus in early life?

Accepted Answer

It is essential for the maturation of T lymphocytes, which are critical for adaptive immunity.

Endocrine System: Structure, Function, and Histology Study Guide

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