Question 1

Which of the following best describes the difference between the endocrine and nervous systems in terms of how they communicate with target cells?

Accepted Answer

The endocrine system releases hormones into the blood, which travel to distant target cells, while the nervous system releases neurotransmitters directly onto target cells.

Question 2

A patient presents with high blood calcium levels. Which hormone is most likely to be secreted in response, and what is its primary effect?

Accepted Answer

Calcitonin; inhibits osteoclast activity to lower blood calcium

Question 3

Which of the following is a correct sequence for the negative feedback regulation of thyroid hormone production?

Accepted Answer

Low $$T_3$$/$$T_4$$ → Hypothalamus releases TRH → Anterior pituitary releases TSH → Thyroid releases $$T_3$$/$$T_4$$

Question 4

A patient with a pituitary tumor is found to have elevated growth hormone (GH) levels after the closure of epiphyseal plates. Which condition is most likely present?

Accepted Answer

Acromegaly

Question 5

Which hormone is secreted by the adrenal cortex and is primarily responsible for sodium retention and potassium excretion in the kidneys?

Accepted Answer

Aldosterone

Question 6

Which of the following best explains why steroid hormones generally have longer half-lives in the blood compared to peptide hormones?

Accepted Answer

Steroid hormones are bound to plasma proteins, which protect them from degradation.

Question 7

A patient is experiencing symptoms of hyperglycemia, polyuria, and polydipsia. Laboratory tests reveal the presence of ketone bodies in the urine. Which condition is most likely?

Accepted Answer

Type 1 diabetes mellitus

Question 8

Which of the following best describes the mechanism of action for hydrophilic peptide hormones?

Accepted Answer

They bind to cell surface receptors, activating second messenger systems such as cAMP.

Question 9

Which hormone is produced by the heart and acts to decrease blood pressure by promoting natriuresis and vasodilation?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 10

A patient with Graves disease is likely to present with which of the following symptoms?

Accepted Answer

Weight loss, heat intolerance, and exophthalmos

Question 11

Which of the following is a correct example of a hormone acting as an antagonist to another hormone?

Accepted Answer

Insulin and glucagon regulating blood glucose levels

Question 12

Which hormone is secreted in response to low oxygen levels in the blood and stimulates red blood cell production?

Accepted Answer

Erythropoietin (EPO)

Question 13

A patient is prescribed corticosteroids for a chronic inflammatory condition. What is a potential risk if the medication is stopped abruptly?

Accepted Answer

Development of Addison disease due to HPA axis suppression

Question 14

Which of the following best describes the role of the hypothalamic-hypophyseal portal system?

Accepted Answer

It allows hypothalamic hormones to reach the anterior pituitary rapidly and in high concentrations.

Question 15

Which hormone is responsible for stimulating the release of milk from the mammary glands and is regulated by a positive feedback loop?

Accepted Answer

Oxytocin

Question 16

Which of the following is a direct effect of parathyroid hormone (PTH) on the kidneys?

Accepted Answer

Increases calcium reabsorption and stimulates conversion of vitamin D to its active form

Question 17

Which hormone is secreted by the adrenal medulla and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 18

A patient with an aldosterone-secreting tumor is likely to develop which of the following electrolyte imbalances?

Accepted Answer

Hypokalemia and hypernatremia

Question 19

Which hormone is produced by adipose tissue and acts on the hypothalamus to induce satiety?

Accepted Answer

Leptin

Question 20

Which of the following best describes the effect of insulin on its target cells?

Accepted Answer

Promotes uptake of glucose, amino acids, and lipids, and storage of nutrients

The Endocrine System: Structure, Function, and Regulation

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