Question 1

Which of the following best explains why the endocrine system is essential for maintaining homeostasis in the human body?

Accepted Answer

It releases hormones into the bloodstream, allowing regulation of activities in distant tissues and organs.

Question 2

A patient presents with symptoms of rapid heartbeat, weight loss, and excessive sweating. Laboratory tests reveal elevated levels of thyroid hormone. Which endocrine disorder is most likely responsible?

Accepted Answer

Graves’ disease

Question 3

Which of the following statements correctly contrasts the endocrine and nervous systems?

Accepted Answer

The endocrine system acts through hormones with slower onset but longer duration, while the nervous system acts through rapid electrical impulses.

Question 4

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

Accepted Answer

Second messenger systems such as increased synthesis of cyclic AMP ($$cAMP)$$

Question 5

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium by stimulating bone resorption, kidney reabsorption, and intestinal absorption?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

A patient with a deficiency in antidiuretic hormone (ADH) would most likely experience which of the following symptoms?

Accepted Answer

High urine output and intense thirst

Question 7

Which of the following best describes the role of the hypothalamus in endocrine system control?

Accepted Answer

It controls the pituitary gland by producing releasing and inhibiting hormones and by direct neural stimulation.

Question 8

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

Accepted Answer

Aldosterone

Question 9

A person with Cushing’s syndrome is likely to exhibit which of the following symptoms due to excess glucocorticoids?

Accepted Answer

Elevated blood glucose, muscle and bone protein loss, and water retention

Question 10

Which of the following is a correct sequence of hormonal regulation involving the hypothalamus, anterior pituitary, and a target endocrine gland?

Accepted Answer

Hypothalamus releases releasing hormone → Anterior pituitary releases tropic hormone → Target gland releases its hormone

Question 11

Which hormone is released by the pancreas in response to high blood glucose levels, and what is one of its primary actions?

Accepted Answer

Insulin; enhances transport of glucose into cells

Question 12

A patient with Addison’s disease would most likely present with which of the following symptoms?

Accepted Answer

Weight loss, dehydration, and hypotension

Question 13

Which of the following best describes the mechanism of action for steroid hormones?

Accepted Answer

They diffuse through the plasma membrane, bind to intracellular receptors, and directly activate gene transcription.

Question 14

Which hormone is responsible for stimulating uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 15

A patient with pituitary dwarfism would most likely have which of the following laboratory findings?

Accepted Answer

Low growth hormone (GH) levels during childhood

Question 16

Which of the following is a function of the hormone calcitonin?

Accepted Answer

Decreases blood calcium by stimulating calcium uptake by bone

Question 17

Which of the following best describes the effect of alcohol on antidiuretic hormone (ADH) secretion?

Accepted Answer

Alcohol inhibits ADH secretion, resulting in increased urine output.

Question 18

Which hormone is produced by the pineal gland and is involved in regulating the sleep-wake cycle?

Accepted Answer

Melatonin

Question 19

A patient with diabetes mellitus is likely to experience which of the following symptoms due to hypoactivity of insulin?

Accepted Answer

Polyuria, polydipsia, and polyphagia

Question 20

Which of the following is a correct example of humoral stimulation of hormone release?

Accepted Answer

Decreasing blood calcium levels stimulate the parathyroid gland to release PTH.

The Endocrine System: Structure, Function, and Disorders

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