Question 1

Which of the following best describes the main difference between the endocrine and nervous systems in terms of signal transmission?

Accepted Answer

The endocrine system transmits hormones through the blood, resulting in slower but longer-lasting effects compared to the nervous system.

Question 2

A patient presents with swelling of the neck due to an enlarged thyroid gland. Laboratory tests reveal low thyroid hormone levels. What is the most likely cause of this condition?

Accepted Answer

Iodine deficiency leading to goiter

Question 3

Which hormone is released in response to high blood glucose levels, and what is its primary effect?

Accepted Answer

Insulin; lowers blood glucose by promoting glucose uptake and storage

Question 4

Which of the following is a water-soluble hormone and how does it exert its effect on target cells?

Accepted Answer

Epinephrine; binds to cell surface receptors and uses second messengers such as $$cAMP$$

Question 5

A researcher blocks the action of adenylate cyclase in a cell. Which hormone's signaling pathway would be most directly affected?

Accepted Answer

Glucagon

Question 6

Which of the following best explains why lipid-soluble hormones generally have longer half-lives than water-soluble hormones?

Accepted Answer

They bind to carrier proteins in the blood, protecting them from degradation.

Question 7

A patient with chronic high insulin levels develops decreased sensitivity to insulin. Which cellular process is most likely responsible?

Accepted Answer

Down-regulation of insulin receptors

Question 8

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

Accepted Answer

Aldosterone; regulates sodium and potassium balance

Question 9

Which of the following is an example of antagonistic hormone interaction?

Accepted Answer

Insulin lowering blood glucose while glucagon raises it

Question 10

A patient is diagnosed with Cushing syndrome. Which of the following findings would you expect?

Accepted Answer

High cortisol levels, muscle wasting, and hypertension

Question 11

Which of the following best describes the mechanism of action for a steroid hormone?

Accepted Answer

Diffuses through the plasma membrane, binds to an intracellular receptor, and alters gene transcription

Question 12

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

Accepted Answer

Oxytocin

Question 13

A patient with untreated Type 1 diabetes mellitus is most likely to experience which of the following complications?

Accepted Answer

Chronic hyperglycemia leading to vascular and nerve damage

Question 14

Which of the following hormones is NOT a tropic hormone released by the anterior pituitary?

Accepted Answer

PRL (Prolactin)

Question 15

Which of the following best describes the pathway for growth hormone (GH) regulation?

Accepted Answer

$$Hypothalamus \rightarrow GHRH \rightarrow Anterior\ pituitary \rightarrow GH \rightarrow Liver \rightarrow IGFs \rightarrow Target\ tissues$$

Question 16

Which of the following is a direct effect of thyroid hormone ($$T_3$$ and $$T_4) on $$the body?

Accepted Answer

Increases Na$$^+/K$^+$$ pump activity, especially in neurons

Question 17

Which hormone is responsible for increasing blood glucose levels during fasting by promoting glycogenolysis and gluconeogenesis in the liver?

Accepted Answer

Glucagon

Question 18

A patient with Addison disease (adrenal insufficiency) would most likely present with which of the following symptoms?

Accepted Answer

Fatigue, hypotension, and skin darkening

Question 19

Which of the following best explains why water-soluble hormones must be secreted more frequently than lipid-soluble hormones?

Accepted Answer

They have a shorter biological half-life and are not protected by carrier proteins.

Endocrine System: Structure, Function, and Hormonal Regulation

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