Q: Which of the following equations correctly represents the conversion of inactive vitamin D to its active form in the kidneys?

$\mathrm{Cholecalciferol} \xrightarrow{\text{Kidneys}} \mathrm{Calcitriol}$

Question 1

Which hormone is responsible for increasing blood calcium levels by stimulating bone breakdown and enhancing calcium absorption in the intestines?

Accepted Answer

Parathyroid hormone (PTH)

Question 2

A patient presents with symptoms of rapid heartbeat, weight loss, and bulging eyes. Blood tests reveal elevated T3 and T4 levels. What is the most likely diagnosis?

Accepted Answer

Grave's disease

Question 3

Which hormone is secreted by the posterior pituitary and is responsible for water retention by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 4

Which of the following is a steroid-based hormone?

Accepted Answer

Cortisol

Question 5

A patient with Cushing's syndrome is likely to have which of the following laboratory findings?

Accepted Answer

High blood glucose and high blood pressure

Question 6

Which hormone stimulates the thyroid gland to release thyroid hormones?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 7

Which process is promoted by insulin in the liver?

Accepted Answer

Glycogenesis

Question 8

Which hormone is produced by the pineal gland and what is its primary function?

Accepted Answer

Melatonin; regulates sleep-wake cycles

Question 9

A patient with Addison's disease is likely to experience which of the following symptoms?

Accepted Answer

Fatigue, weight loss, and hypotension

Question 10

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

Accepted Answer

Parathyroid hormone (PTH)

Question 11

Which of the following is NOT a function of thyroid hormones (T3 and T4)?

Accepted Answer

Stimulate bone breakdown

Question 12

Which hormone is secreted by the adrenal medulla and is responsible for increasing heart rate and blood pressure during stress?

Accepted Answer

Epinephrine

Question 13

Which of the following best describes the mechanism of action for amino acid-based hormones?

Accepted Answer

They bind to cell surface receptors and activate second messengers such as cAMP.

Question 14

Which hormone is responsible for stimulating milk production in the mammary glands?

Accepted Answer

Prolactin (PRL)

Question 15

A patient with type 1 diabetes mellitus is unable to produce which hormone, leading to chronic hyperglycemia?

Accepted Answer

Insulin

Question 16

Which hormone is released from the anterior pituitary and stimulates the adrenal cortex to release corticosteroids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 17

Which of the following equations correctly represents the conversion of inactive vitamin D to its active form in the kidneys?

Accepted Answer

$\mathrm{Cholecalciferol} \xrightarrow{	ext{Kidneys}} \mathrm{Calcitriol}$

Question 18

Which hormone is secreted in response to low blood sodium and acts to conserve sodium in the kidneys?

Accepted Answer

Aldosterone

Question 19

Which of the following is a function of growth hormone (GH)?

Accepted Answer

Promotes bone and muscle growth

Question 20

A patient is experiencing excessive urination, excessive thirst, and excessive hunger. Which condition is most likely responsible for these symptoms?

Accepted Answer

Diabetes mellitus

Endocrine System: Hormones, Glands, and Regulation – Study Notes

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