Question 1

Which of the following best describes the primary function of the endocrine system?

Accepted Answer

It regulates body activities by releasing hormones into the bloodstream to control growth, metabolism, and homeostasis.

Question 2

A patient presents with symptoms of diabetes insipidus, including excessive thirst and urination. Which hormone is most likely deficient?

Accepted Answer

Antidiuretic hormone (ADH)

Question 3

Which of the following is a correct example of a hormone acting through second messengers?

Accepted Answer

Epinephrine binding to a cell membrane receptor and activating cyclic AMP ($$cAMP) as a $$second messenger.

Question 4

Which equation correctly represents the relationship between hormone concentration ($$[H]$$), number of receptors ($$R$$), and degree of target cell activation ($$A$$)?

Accepted Answer

$$A = [H] 	imes R$$

Question 5

A patient with Graves' disease is experiencing hyperthyroidism. Which hormone is being overproduced?

Accepted Answer

Thyroxine ($$T_4)$$

Question 6

Which of the following best explains the difference between amino acid-based hormones and steroid-based hormones?

Accepted Answer

Amino acid-based hormones bind to cell surface receptors, while steroid-based hormones bind to intracellular receptors.

Question 7

Which hormone is released by the adrenal cortex and is primarily responsible for regulating sodium and potassium balance?

Accepted Answer

Aldosterone

Question 8

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

Accepted Answer

Parathyroid hormone (PTH)

Question 9

Which of the following scenarios best illustrates hormonal synergism?

Accepted Answer

Growth hormone and thyroid hormone together promote normal growth, producing a greater effect than either alone.

Question 10

Which hormone is produced by beta cells in the pancreas and facilitates cellular uptake of glucose?

Accepted Answer

Insulin

Question 11

A patient is diagnosed with acromegaly, characterized by abnormal growth of hands and face. Which hormone is most likely elevated?

Accepted Answer

Growth hormone (GH)

Question 12

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

Accepted Answer

Increase blood calcium by stimulating osteoclast activity.

Question 13

Which hormone is released from the hypothalamus to stimulate the anterior pituitary to secrete ACTH?

Accepted Answer

Corticotropin-releasing hormone (CRH)

Question 14

A patient with Addison's disease has low levels of cortisol and aldosterone. Which part of the adrenal gland is most likely affected?

Accepted Answer

Zona glomerulosa and zona fasciculata of the adrenal cortex

Question 15

Which of the following best describes antagonism in hormone interactions?

Accepted Answer

One hormone opposes the action of another hormone on the same target cell.

Question 16

Which hormone is responsible for stimulating the release of thyroid hormones from the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 17

A patient with Type 1 diabetes mellitus is unable to produce insulin. Which of the following equations best represents the effect on blood glucose ($$BG) $$over time ($$t) $$without insulin?

Accepted Answer

$$BG(t) = BG_0$ + kt$$

Question 18

Which hormone is secreted by alpha cells of the pancreas and increases blood glucose levels by promoting gluconeogenesis?

Accepted Answer

Glucagon

Question 19

Which of the following is a medical implication of too little thyroid hormone during childhood?

Accepted Answer

Cretinism

Question 20

Which hormone is released from the posterior pituitary and acts on the kidneys to promote water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Chapter 16: The Endocrine System – Structure, Function, and Hormonal Regulation

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