Question 1

Which gland is responsible for secreting hormones that regulate metabolism, and what is the primary hormone it releases?

Accepted Answer

Thyroid gland; thyroxine (T4)

Question 2

A patient presents with symptoms of gigantism, including excessive height and large hands and feet. Laboratory tests reveal elevated growth hormone (GH) levels. Which structure is most likely affected?

Accepted Answer

Anterior pituitary gland

Question 3

Which hormone is released from the posterior pituitary and is responsible for stimulating uterine contractions during labor?

Accepted Answer

Oxytocin

Question 4

A 47-year-old female is diagnosed with Type II Diabetes. Which cells are primarily not functioning properly, and where are they located?

Accepted Answer

Beta cells in the pancreas

Question 5

Which hormone stimulates the adrenal cortex to release glucocorticoids, and what is the effect of its hypersecretion?

Accepted Answer

Adrenocorticotropic hormone (ACTH); Cushing's disease

Question 6

Which of the following best describes the hypothalamo-hypophyseal portal system?

Accepted Answer

A system of two capillary beds connected by veins, allowing hypothalamic hormones to regulate the anterior pituitary

Question 7

Which hormone is responsible for stimulating milk production in nursing women, and what is a possible effect of its inappropriate secretion in males?

Accepted Answer

Prolactin; impotence

Question 8

A patient with diabetes insipidus is unable to concentrate urine. Which hormone is deficient, and where is it produced?

Accepted Answer

Antidiuretic hormone (ADH); hypothalamus

Question 9

Which hormone is secreted by the zona glomerulosa of the adrenal cortex, and what is its primary function?

Accepted Answer

Aldosterone; increases sodium reabsorption in the kidneys

Question 10

A patient is experiencing symptoms of hypothyroidism, including fatigue and weight gain. Which hormone is likely deficient, and what is the effect on metabolic rate?

Accepted Answer

Thyroid hormone (T3/T4); decreased metabolic rate

Question 11

Which hormone is released in response to low blood calcium levels, and what is its effect on the bones?

Accepted Answer

Parathyroid hormone (PTH); increases bone resorption

Question 12

Which hormone is released from the adrenal medulla during the short-term stress response, and what is one of its effects?

Accepted Answer

Epinephrine; increases heart rate

Question 13

A patient with a pituitary tumor is found to have elevated ACTH and cortisol levels. Which feedback mechanism is likely disrupted?

Accepted Answer

Negative feedback from cortisol to the anterior pituitary

Question 14

Which hormone is responsible for stimulating ovarian follicle maturation in females and sperm production in males?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 15

A patient presents with symptoms of Cushing's disease. Which hormone is likely elevated, and what is a common cause?

Accepted Answer

Adrenocorticotropic hormone (ACTH); pituitary tumor

Question 16

Which hormone is secreted by the parafollicular cells of the thyroid gland, and what is its primary effect?

Accepted Answer

Calcitonin; lowers blood calcium

Question 17

A patient with failure of sexual maturation is found to have low levels of FSH and LH. Which gland is most likely dysfunctional?

Accepted Answer

Anterior pituitary gland

Question 18

Which hormone is released from the hypothalamus to stimulate the anterior pituitary to secrete TSH?

Accepted Answer

Thyrotropin-releasing hormone (TRH)

Question 19

Which of the following best describes the difference between the anterior and posterior pituitary in terms of hormone release?

Accepted Answer

The anterior pituitary synthesizes and releases its own hormones in response to hypothalamic signals, while the posterior pituitary stores and releases hormones made in the hypothalamus.

The Endocrine System: Structure, Function, and Clinical Relevance

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