Question 1

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

Accepted Answer

Endocrine glands are ductless and release hormones into the bloodstream, while exocrine glands have ducts and release products onto body surfaces or into body cavities.

Question 2

A patient presents with symptoms of excessive thirst, frequent urination, and excessive hunger. Which hormone imbalance is most likely responsible for these symptoms?

Accepted Answer

Deficiency of insulin

Question 3

Which of the following is NOT a factor that determines target cell activation by a hormone?

Accepted Answer

The size of the target cell

Question 4

Amino acid-based hormones typically exert their effects through which of the following mechanisms?

Accepted Answer

G protein second messenger systems on the plasma membrane

Question 5

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

Accepted Answer

Parathyroid hormone (PTH); increases blood calcium by stimulating bone resorption

Question 6

A patient with hypersecretion of thyroid hormone (TH) is most likely to experience which of the following symptoms?

Accepted Answer

Weight loss, increased heart rate, and heat intolerance

Question 7

Which hormone is responsible for stimulating the kidneys to reabsorb water and decrease urine output, and what is a likely symptom of its hyposecretion?

Accepted Answer

Antidiuretic hormone (ADH); excessive urination (polyuria)

Question 8

Which of the following best explains the process of up-regulation in hormone receptor dynamics?

Accepted Answer

Target cells form more receptors in response to low hormone levels.

Question 9

Which hormone is secreted by the adrenal cortex and is primarily responsible for increasing sodium reabsorption in the kidneys?

Accepted Answer

Aldosterone

Question 10

A patient is experiencing chronic stress. Which hormone is most likely to be elevated, and what is one of its major effects?

Accepted Answer

Cortisol; increases gluconeogenesis and suppresses immune response

Question 11

Which of the following best describes the role of the pineal gland?

Accepted Answer

Secretes melatonin to regulate circadian rhythms

Question 12

Which hormone is released by the anterior pituitary and stimulates the production of gametes?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 13

Which of the following is a correct sequence for the hormonal release of thyroid hormone?

Accepted Answer

Hypothalamus → Anterior pituitary → Thyroid gland

Question 14

Which hormone is essential for the development of T lymphocytes and where is it produced?

Accepted Answer

Thymopoietins; thymus

Question 15

A patient with damage to the hypothalamus would most likely experience which of the following consequences?

Accepted Answer

Impaired regulation of multiple endocrine glands due to loss of releasing and inhibiting hormones

Question 16

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

Accepted Answer

Insulin; decreases blood glucose

Question 17

Which of the following is a function of leptin released by adipose tissue?

Accepted Answer

Regulates the sensation of satiety

Question 18

Which hormone is responsible for stimulating uterine contractions during childbirth, and what type of feedback mechanism does it use?

Accepted Answer

Oxytocin; positive feedback

Question 19

Which hormone is secreted by the heart and what is its primary function?

Accepted Answer

Atrial natriuretic peptide (ANP); reduces blood pressure and blood volume

Question 20

A patient is dehydrated and has low blood pressure. Which mechanism is activated to restore homeostasis, and what is the sequence of hormone release?

Accepted Answer

Renin-angiotensin mechanism: Renin → Angiotensin II → Aldosterone → ADH

The Endocrine System: Structure, Function, and Regulation

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