Question 1

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

Accepted Answer

Endocrine glands secrete hormones directly into the blood, while exocrine glands release substances onto epithelial surfaces via ducts.

Question 2

Which statement correctly compares the nervous and endocrine systems?

Accepted Answer

The nervous system initiates rapid, short-duration responses using neurotransmitters, while the endocrine system initiates slower, long-duration responses using hormones.

Question 3

A patient is given a drug that blocks adenylate cyclase activity. Which type of hormone signaling would be most affected?

Accepted Answer

Water-soluble hormone signaling via cAMP second messenger pathways

Question 4

Which of the following is TRUE regarding lipid-soluble hormones?

Accepted Answer

They bind to intracellular receptors and directly activate genes.

Question 5

A person with a deficiency in growth hormone (GH) secretion during childhood is most likely to:

Accepted Answer

Become a dwarf but have fairly normal body proportions.

Question 6

Which of the following hormones is NOT secreted by the anterior pituitary?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

Which type of stimulus is responsible for the release of parathyroid hormone (PTH)?

Accepted Answer

Humoral stimulus

Question 8

Which of the following best explains why lipid-soluble hormones generally remain in the blood longer than water-soluble hormones?

Accepted Answer

Lipid-soluble hormones are bound to plasma proteins, which slows their removal from the blood.

Question 9

Which hormone is released in response to increased blood osmolarity and acts on the kidneys to preserve water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 10

A patient presents with excessive thirst and frequent urination. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes insipidus

Question 11

Which of the following is a tropic hormone produced by the anterior pituitary that stimulates the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 12

Which hormone is responsible for stimulating milk production in the mammary glands?

Accepted Answer

Prolactin (PRL)

Question 13

Which of the following best describes the mechanism of action for water-soluble hormones?

Accepted Answer

They bind to plasma membrane receptors and activate second messenger systems.

Question 14

A patient has elevated levels of both insulin and glucagon. What is the most likely effect on blood glucose levels?

Accepted Answer

Blood glucose levels may remain relatively stable due to antagonistic effects.

Question 15

Which hormone is released from the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 16

Which of the following is a correct sequence for the hypothalamic-pituitary axis involving thyroid hormone release?

Accepted Answer

TRH (from hypothalamus) → TSH (from anterior pituitary) → T3/T4 (from thyroid gland)

Question 17

Which of the following equations correctly represents the negative feedback regulation of hormone release?

Accepted Answer

$Hormone_{release} \propto \frac{1}{Target_{organ\ effect}}$

Question 18

Which hormone is released in response to cervical and uterine stretching and is involved in smooth muscle contraction during labor?

Accepted Answer

Oxytocin

Question 19

Which of the following is a real-life example of hormone synergism?

Accepted Answer

Reproductive hormones and thyroid hormone both required for normal development of reproductive organs.

Question 20

Which of the following statements about hormone receptors is correct?

Accepted Answer

An organ will only respond to a hormone if it has the appropriate receptor for that hormone.

The Endocrine System – Part 1: Overview, Hormones, and Major Glands

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