Question 1

Steroid hormones are derived from which molecule, and how does their chemical structure affect their mechanism of action within target cells?

Accepted Answer

Steroid hormones are derived from cholesterol, enabling them to diffuse through the cell membrane and bind to intracellular receptors.

Question 2

A patient presents with symptoms of weight loss, heat intolerance, and increased heart rate. Which endocrine disorder is most likely, and what hormone is primarily involved?

Accepted Answer

Hyperthyroidism; increased levels of T3 and T4.

Question 3

Which of the following best describes the mechanism by which polar (amino acid-based) hormones exert their effects on target cells?

Accepted Answer

They bind to cell surface receptors and activate second messenger systems such as cAMP.

Question 4

Which two hormones are produced by the hypothalamus and stored in the posterior pituitary?

Accepted Answer

ADH (antidiuretic hormone) and oxytocin

Question 5

A patient with diabetes insipidus is likely to have a deficiency in which hormone, and what is the primary effect on the body?

Accepted Answer

Deficiency in ADH; inability to concentrate urine, leading to excessive urination.

Question 6

Which hormone acts as the antagonist to aldosterone, and what is its effect on sodium and water balance?

Accepted Answer

Atrial natriuretic peptide (ANP); decreases sodium reabsorption and promotes water excretion.

Question 7

The hypothalamus releases tropic hormones that regulate the anterior pituitary. Which of the following is NOT a tropic hormone released by the hypothalamus?

Accepted Answer

Oxytocin

Question 8

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

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands release substances into ducts.

Question 9

A patient has low blood calcium levels. Which hormone is released, and what are the three mechanisms by which it raises calcium?

Accepted Answer

Parathyroid hormone (PTH); increases bone resorption, increases intestinal absorption, increases renal reabsorption.

Question 10

Which hormone is more potent: T3 or T4? How are they related?

Accepted Answer

T3 is more potent; T4 is converted to T3 in peripheral tissues.

Question 11

Which of the following best describes the role of negative feedback in the endocrine system?

Accepted Answer

Negative feedback inhibits hormone secretion when target hormone levels are sufficient, maintaining homeostasis.

Question 12

Which hormone is responsible for increasing blood glucose levels, and what is its mechanism of action?

Accepted Answer

Glucagon; stimulates glycogen breakdown and gluconeogenesis in the liver.

Question 13

Which of the following is a sign or symptom of hypothyroidism?

Accepted Answer

Weight gain, cold intolerance, fatigue

Question 14

Which hormone is released in response to a humoral stimulus, and what is an example of such a stimulus?

Accepted Answer

Insulin; released in response to high blood glucose levels

Question 15

Which of the following best describes the second messenger system used by many amino acid-based hormones?

Accepted Answer

Hormone binds to cell surface receptor, activating a G protein, which then activates adenylate cyclase to produce cAMP.

Question 16

Which of the following hormones is produced by the anterior pituitary?

Accepted Answer

ACTH (adrenocorticotropic hormone)

Question 17

A patient is found to have SIADH (syndrome of inappropriate antidiuretic hormone). What is the primary effect on the body?

Accepted Answer

Water retention, hyponatremia, and concentrated urine

Question 18

Which of the following best describes upregulation in hormone receptor dynamics?

Accepted Answer

Increase in the number of receptors in response to low hormone levels

Question 19

Which of the following best describes the difference between prolactin and oxytocin?

Accepted Answer

Prolactin stimulates milk production, while oxytocin stimulates milk ejection.

Question 20

A patient is experiencing increased blood volume and pressure due to aldosterone. Which equation best represents the relationship between blood volume, blood pressure, and sodium reabsorption?

Accepted Answer

Blood Volume $$\propto$$ Sodium Reabsorption $$\rightarrow$$ Blood Pressure $$\propto$$ Blood Volume$

Endocrine System Study Guide – Hormones, Glands, and Regulation

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드