Question 1

Which of the following best describes the primary difference between the endocrine and nervous systems in terms of communication and response time?

Accepted Answer

The endocrine system releases hormones into the bloodstream, resulting in slower but longer-lasting effects compared to the rapid, short-acting responses of the nervous system.

Question 2

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

Accepted Answer

Parathyroid hormone (PTH); stimulates osteoclasts to release calcium from bone.

Question 3

Which hormone is produced by the zona glomerulosa of the adrenal cortex, and what is its main function?

Accepted Answer

Aldosterone; increases sodium reabsorption in the kidneys.

Question 4

A person is experiencing high blood glucose levels after a meal. Which hormone is released to lower blood glucose, and what is the mechanism?

Accepted Answer

Insulin; promotes uptake of glucose by cells and storage as glycogen.

Question 5

Which of the following correctly matches the hormone with its source and primary target?

Accepted Answer

Thyroid-stimulating hormone (TSH); produced by the anterior pituitary; targets the thyroid gland.

Question 6

A patient with a tumor in the anterior pituitary is found to have elevated levels of ACTH. Which of the following is a likely consequence?

Accepted Answer

Increased secretion of cortisol from the adrenal cortex.

Question 7

Which hormone is released from the posterior pituitary and is involved in water retention by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 8

Which of the following best explains the negative feedback mechanism regulating parathyroid hormone (PTH) secretion?

Accepted Answer

Rising blood calcium levels inhibit PTH release, reducing calcium mobilization from bone.

Question 9

A patient is found to have excessive water retention and low urine output. Which hormone is most likely elevated, and what is its effect on the kidneys?

Accepted Answer

Antidiuretic hormone (ADH); increases water reabsorption in the collecting ducts.

Question 10

Which of the following correctly describes the role of the hypothalamus in the hypothalamic-pituitary axis?

Accepted Answer

It produces releasing hormones that stimulate the anterior pituitary via the infundibulum's blood supply.

Question 11

Which hormone is secreted by the thyroid gland and acts as an antagonist to parathyroid hormone (PTH)?

Accepted Answer

Calcitonin

Question 12

A patient with Addison's disease has damage to the adrenal cortex. Which hormone would you expect to be deficient, and what is a likely symptom?

Accepted Answer

Cortisol; hypoglycemia

Question 13

Which of the following best describes the function of follicle-stimulating hormone (FSH) in the female reproductive system?

Accepted Answer

Stimulates follicle maturation and estrogen production

Question 14

Which hormone is secreted in response to high blood pressure and acts to increase urine output by inhibiting both renin and aldosterone secretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 15

A patient is given a drug that blocks the action of aldosterone. What effect would you expect on sodium and potassium levels in the blood?

Accepted Answer

Decreased sodium reabsorption and increased potassium retention

Question 16

Which of the following is a correct sequence of hormone release in the hypothalamic-pituitary-thyroid axis?

Accepted Answer

Thyrotropin-releasing hormone (TRH) → Thyroid-stimulating hormone (TSH) → Thyroid hormones (T3 and T4)

Question 17

A patient with a deficiency in growth hormone-releasing hormone (GHRH) from the hypothalamus would most likely have which of the following?

Accepted Answer

Decreased growth hormone (GH) secretion from the anterior pituitary

Question 18

Which of the following best describes the effect of calcitonin on bone and blood calcium levels?

Accepted Answer

Inhibits osteoclast activity, decreasing blood calcium

Question 19

A patient is experiencing symptoms of hyperthyroidism, such as weight loss and increased heart rate. Which hormone is likely elevated?

Accepted Answer

Thyroid hormones (T3 and T4)

Question 20

Which of the following correctly matches the adrenal medulla with its primary hormone and function?

Accepted Answer

Adrenal medulla; epinephrine; mediates the fight-or-flight response

The Endocrine System: Structure, Function, and Hormonal Regulation

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