Question 1

Which hormone is primarily responsible for lowering blood glucose levels after a meal, and what is its main mechanism of action?

Accepted Answer

Insulin; it signals cells in the liver, muscle, and fat to take up glucose from the bloodstream.

Question 2

A patient is experiencing excessive hunger and increased food intake due to perceived starvation, despite high blood glucose levels. Which term best describes this symptom, and what is the physiological explanation?

Accepted Answer

Polyphagia; the body attempts to gain energy from other sources like fats and proteins.

Question 3

Which hormone is released during stress to mediate the 'fight-or-flight' response, and what are two of its immediate effects?

Accepted Answer

Epinephrine; increases heart rate and mobilizes glucose for energy.

Question 4

Which hormone is responsible for raising blood calcium levels, and through which two mechanisms does it achieve this?

Accepted Answer

Parathyroid hormone (PTH); by stimulating bone resorption and increasing calcium reabsorption in the kidneys.

Question 5

A person with a deficiency in thyroid hormones (T4 and T3) would most likely experience which of the following symptoms?

Accepted Answer

Decreased metabolic rate, fatigue, and impaired growth.

Question 6

Which hormone is produced by fat cells and acts on the hypothalamus to decrease hunger and increase feelings of fullness?

Accepted Answer

Leptin

Question 7

During periods of low blood glucose, which hormone is released to stimulate the breakdown of glycogen and promote gluconeogenesis?

Accepted Answer

Glucagon

Question 8

Which hormone helps regulate the body's base metabolic rate (BMR), body temperature, and weight management?

Accepted Answer

Thyroxine (T4)

Question 9

A patient is found to have abnormally high blood calcium levels. Which hormone is most likely underactive, and what is its normal function?

Accepted Answer

Calcitonin; it lowers blood calcium by inhibiting bone breakdown.

Question 10

Which hormone is essential for the development of male reproductive organs and secondary sex characteristics, such as increased muscle mass?

Accepted Answer

Testosterone

Question 11

Which hormone is released by the anterior pituitary and stimulates the thyroid gland to produce thyroid hormones?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 12

Which hormone is involved in the regulation of the sleep-wake cycle and blood pressure, and what gland produces it?

Accepted Answer

Cortisol; produced by the adrenal gland.

Question 13

A patient is experiencing chronic inflammation. Which hormone, if administered in short bursts, could help suppress this inflammation?

Accepted Answer

Cortisol

Question 14

Which hormone promotes the storage of excess glucose as glycogen in the liver and muscles, and also stimulates fat storage in adipose tissue?

Accepted Answer

Insulin

Question 15

Which hormone is responsible for regulating phosphate levels by causing the kidneys to excrete phosphate, and what is its effect on calcium?

Accepted Answer

Parathyroid hormone (PTH); it raises blood calcium levels.

Question 16

Which hormone is released in response to stress and increases blood glucose by promoting gluconeogenesis and decreasing glucose uptake in muscle and adipose tissue?

Accepted Answer

Cortisol

Question 17

Which hormone is essential for the maturation of female reproductive organs and secondary sex characteristics, and also regulates the menstrual cycle?

Accepted Answer

Estrogen

Question 18

Which hormone acts as a second messenger in the activation of water-soluble hormone pathways, and what is the general mechanism by which it works?

Accepted Answer

Cyclic AMP (cAMP); it transmits the signal from the hormone-receptor complex to intracellular targets.

Question 19

Which hormone is produced by the thyroid's C cells and may play a role in calcium transfer to the fetus during pregnancy?

Accepted Answer

Calcitonin

Question 20

A patient is experiencing symptoms of low alertness and poor focus during stressful situations. Which hormone is most likely deficient?

Accepted Answer

Norepinephrine

Endocrine System Hormones: Structure, Function, and Regulation

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