Question 1

Which of the following best describes the main difference between endocrine and nervous system signaling?

Accepted Answer

Endocrine signaling involves hormones released into the bloodstream, while nervous signaling involves neurotransmitters released at synapses.

Question 2

A patient presents with symptoms of hypothyroidism. Which hormone is most likely deficient?

Accepted Answer

Thyroxine ($$T_4)$$

Question 3

Which of the following is NOT a function of antidiuretic hormone (ADH)?

Accepted Answer

Stimulating the release of aldosterone from the adrenal cortex

Question 4

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium?

Accepted Answer

Parathyroid hormone (PTH)

Question 5

A patient with Addison's disease is most likely to have a deficiency in which hormone?

Accepted Answer

Cortisol

Question 6

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

Accepted Answer

They enter the cell and bind to intracellular receptors, directly affecting gene transcription.

Question 7

Which hormone is produced by the beta cells of the pancreas and lowers blood glucose levels?

Accepted Answer

Insulin

Question 8

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

Accepted Answer

Increased calcium release from bones

Question 9

A patient is experiencing symptoms of Cushing's syndrome. Which hormone is most likely elevated?

Accepted Answer

Cortisol

Question 10

Which of the following hormones is released from the posterior pituitary and is involved in uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 11

Which hormone is responsible for stimulating the adrenal cortex to release glucocorticoids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 12

Which of the following best describes the role of insulin in glucose metabolism?

Accepted Answer

Insulin decreases blood glucose by promoting cellular uptake and storage as glycogen.

Question 13

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

Accepted Answer

High blood calcium and low phosphate

Question 14

Which hormone is secreted by the anterior pituitary and stimulates milk production in the mammary glands?

Accepted Answer

Prolactin

Question 15

Which of the following is a function of aldosterone?

Accepted Answer

Increases sodium reabsorption and potassium excretion in the kidneys

Question 16

Which hormone is released in response to stress and increases blood glucose by stimulating gluconeogenesis?

Accepted Answer

Cortisol

Question 17

Which of the following hormones is produced by the pineal gland and regulates circadian rhythms?

Accepted Answer

Melatonin

Question 18

A patient with diabetes insipidus is most likely to have a deficiency in which hormone?

Accepted Answer

Antidiuretic hormone (ADH)

Question 19

Which of the following best describes the feedback mechanism regulating thyroid hormone levels?

Accepted Answer

Negative feedback involving the hypothalamus and pituitary

Question 20

Which hormone is responsible for stimulating ovulation in females?

Accepted Answer

Luteinizing hormone (LH)

Endocrine System: Structure, Function, and Hormonal Regulation

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