Question 1

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands release hormones directly into the bloodstream, while exocrine glands secrete their products by way of a duct onto an epithelial surface.

Question 2

A patient presents with symptoms of gigantism. Which hormone is most likely being secreted in excess, and from which gland?

Accepted Answer

Growth hormone (GH) from the anterior pituitary gland

Question 3

Which feedback mechanism is most commonly responsible for regulating hormone secretion?

Accepted Answer

Negative feedback, where the hormone inhibits further secretion

Question 4

Which hormone stimulates the secretion of insulin-like growth factors (IGFs) that promote growth, protein synthesis, and fat breakdown?

Accepted Answer

Growth hormone (GH)

Question 5

A patient with diabetes mellitus is unable to regulate blood glucose levels. Which hormone is most directly involved in this process?

Accepted Answer

Insulin

Question 6

Which of the following is a correct statement about steroid hormones?

Accepted Answer

Steroid hormones are derived from cholesterol and act directly on genes by activating or inhibiting transcription.

Question 7

Which hormone is responsible for stimulating ovulation in females and testosterone secretion in males?

Accepted Answer

Luteinizing hormone (LH)

Question 8

Which of the following best describes the role of the hypothalamus in endocrine regulation?

Accepted Answer

It is the major integrating link between the nervous and endocrine systems, controlling pituitary hormone release.

Question 9

A patient is experiencing dehydration. Which hormone is likely to be secreted in response to conserve water, and from which gland?

Accepted Answer

Antidiuretic hormone (ADH) from the posterior pituitary

Question 10

Which of the following hormones is NOT produced by the anterior pituitary gland?

Accepted Answer

Oxytocin (OT)

Question 11

Which hormone increases metabolic rate and is released in response to thyroid-stimulating hormone (TSH)?

Accepted Answer

Thyroxine (T4)

Question 12

Which of the following is a peptide hormone produced by the posterior pituitary and is involved in water retention?

Accepted Answer

Antidiuretic hormone (ADH)

Question 13

Which hormone is responsible for stimulating the secretion of estrogen in the ovaries?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 14

Which of the following best describes the anatomical location of the thyroid gland?

Accepted Answer

It is found just below the larynx at the base of the throat.

Question 15

Which hormone is secreted by the adrenal cortex and is involved in the regulation of blood pressure and sodium retention?

Accepted Answer

Aldosterone

Question 16

Which of the following is a correct statement about the effect of aging on endocrine organs?

Accepted Answer

Aging decreases the secretion of growth hormone (GH), leading to reduced muscle and bone mass.

Question 17

Which hormone is synthesized from the amino acid tryptophan and regulates sleep-wake cycles?

Accepted Answer

Melatonin

Question 18

Which of the following equations correctly represents the relationship between hormone concentration and receptor binding?

Accepted Answer

$C = \frac{[H][R]}{K_d}$

Question 19

A patient has low blood calcium levels. Which hormone is most likely to be secreted to restore calcium homeostasis?

Accepted Answer

Parathyroid hormone (PTH)

Question 20

Which hormone is released in response to neural impulses from the hypothalamus and is involved in uterine contractions during childbirth?

Accepted Answer

Oxytocin (OT)

Endocrine System: Structure, Function, and Hormonal Regulation

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