Question 1

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

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete substances through ducts to an epithelial surface.

Question 2

A patient is experiencing symptoms of high blood glucose, increased urination, and dehydration. Laboratory tests reveal normal insulin levels, but tissues are not responding to insulin. Which type of diabetes does this patient most likely have?

Accepted Answer

Type 2 diabetes mellitus

Question 3

Which of the following hormones is derived from cholesterol and is lipid-soluble?

Accepted Answer

Cortisol

Question 4

A hormone binds to a receptor on the plasma membrane of a target cell, activating a G protein, which then activates adenylate cyclase. This leads to the production of a secondary messenger. Which secondary messenger is most commonly produced in this pathway?

Accepted Answer

$$cAMP$$

Question 5

Which of the following best explains the concept of 'permissiveness' in hormone interactions?

Accepted Answer

One hormone cannot exert its full effects without the presence of another hormone.

Question 6

A patient presents with muscle weakness, bone pain, and kidney stones. Blood tests reveal hypercalcemia. Which endocrine disorder is most likely responsible for these symptoms?

Accepted Answer

Hyperparathyroidism

Question 7

Which of the following is a correct sequence of events for a lipid-soluble hormone's mechanism of action?

Accepted Answer

Hormone diffuses through plasma membrane $$\rightarrow$$ binds to intracellular receptor $$\rightarrow$$ alters gene expression $$\rightarrow$$ new proteins synthesized

Question 8

Which hormone is released in response to low blood calcium levels and acts to increase calcium concentration in the blood?

Accepted Answer

Parathyroid hormone (PTH)

Question 9

A patient with a pituitary tumor is found to have excessive growth hormone secretion after puberty. Which condition is most likely present?

Accepted Answer

Acromegaly

Question 10

Which of the following best describes the role of aldosterone?

Accepted Answer

Regulates sodium and potassium ion concentrations in the body fluids

Question 11

A patient is experiencing rapid heartbeat, weight loss, and bulging eyes. Laboratory tests reveal elevated thyroid hormone levels. Which condition is most likely responsible?

Accepted Answer

Graves' disease

Question 12

Which of the following is a correct example of hormone antagonism?

Accepted Answer

Insulin lowers blood glucose while glucagon raises blood glucose

Question 13

Which hormone is produced by the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 14

Which of the following best describes the effect of a water-soluble hormone on its target cell?

Accepted Answer

It binds to a membrane receptor and activates a second messenger system

Question 15

A patient is given a drug that blocks the action of protein kinases. Which hormone signaling pathway would be most directly affected?

Accepted Answer

cAMP-mediated pathway

Question 16

Which of the following is a correct example of a hormone released in response to neural stimuli?

Accepted Answer

Epinephrine released from the adrenal medulla during stress

Question 17

Which hormone is responsible for stimulating the production of red blood cells in the bone marrow?

Accepted Answer

Erythropoietin

Question 18

A patient with Addison's disease is likely to have which of the following symptoms?

Accepted Answer

Low blood pressure and weight loss

Question 19

Which hormone is secreted by the anterior pituitary and stimulates the thyroid gland to produce thyroid hormones?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 20

A patient is found to have low levels of parathyroid hormone following thyroid surgery. Which of the following laboratory findings would you expect?

Accepted Answer

Low blood calcium levels

Endocrinology: Hormones, Mechanisms, and Functional Classification

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