Question 1

A patient presents with symptoms of hypercalcemia. Which hormone is most likely deficient, and what is its primary mechanism of action?

Accepted Answer

Calcitonin; decreases blood calcium levels by inhibiting osteoclast activity

Question 2

Which of the following best describes the mechanism by which water-soluble hormones exert their effects on target cells?

Accepted Answer

They use secondary messenger systems such as cAMP to activate protein kinases

Question 3

A patient with chronic stress is found to have elevated levels of a hormone that increases blood glucose and suppresses immune function. Which hormone is this, and from which gland is it released?

Accepted Answer

Cortisol; adrenal cortex

Question 4

If a hormone's effect on a target cell depends on the presence of another hormone, this relationship is called:

Accepted Answer

Permissiveness

Question 5

Which equation best represents the relationship between hormone concentration ($$[H]$$), receptor number ($$R$$), and cellular response ($$C$$)?

Accepted Answer

$$C = [H] 	imes R$$

Question 6

A patient is diagnosed with diabetes mellitus. Which pancreatic cell type is most likely malfunctioning, and what is the primary function of the hormone it produces?

Accepted Answer

Beta cells; decrease blood glucose by releasing insulin

Question 7

Which hormone is released by the posterior pituitary and is involved in water retention by the kidneys? What is the physiological effect if this hormone is deficient?

Accepted Answer

Antidiuretic hormone (ADH); increased urine output and risk of dehydration

Question 8

A patient with low blood calcium is given a hormone that stimulates osteoclasts. Which hormone is this, and what is the expected effect?

Accepted Answer

Parathyroid hormone (PTH); increase blood calcium levels

Question 9

Which hormone is secreted by the placenta during pregnancy and is commonly used as a marker in pregnancy tests?

Accepted Answer

HCG (Human Chorionic Gonadotropin)

Question 10

Which of the following is a negative feedback mechanism in hormone regulation, and what is its physiological significance?

Accepted Answer

Thyroid hormone regulation; maintains stable metabolic rate

Question 11

Which hormone is synthesized by the hypothalamus and stored in the posterior pituitary, and what is its primary function?

Accepted Answer

Antidiuretic hormone (ADH); promotes water retention in kidneys

Question 12

Which hormone is responsible for stimulating the release of thyroid hormones from the thyroid gland?

Accepted Answer

Thyroid Stimulating Hormone (TSH)

Question 13

A patient with Addison's disease has impaired adrenal cortex function. Which hormone is most likely deficient, and what is its primary role?

Accepted Answer

Aldosterone; controls blood balance of minerals and water

Question 14

Which hormone is primarily associated with the regulation of the sleep-wake cycle, and what is its source?

Accepted Answer

Melatonin; pineal gland

Question 15

Which of the following best describes the exocrine function of the pancreas?

Accepted Answer

Secreting digestive enzymes to the small intestine

Question 16

Amino acid-based hormones are primarily water-soluble. Which of the following is an exception to this rule?

Accepted Answer

Thyroid hormone

Question 17

Which hormone is released by the adrenal medulla in response to acute stress, and what is its effect on the body?

Accepted Answer

Epinephrine; increases heart rate and blood pressure

Question 18

Which hormone is NOT produced by the anterior lobe of the pituitary gland?

Accepted Answer

Oxytocin

Question 19

Which hormone is responsible for increasing blood glucose levels during fasting, and which cell type produces it?

Accepted Answer

Glucagon; alpha cells

Question 20

Which tissue primarily composes the anterior lobe of the pituitary gland, and what is its significance for hormone production?

Accepted Answer

Glandular tissue; allows synthesis and release of multiple hormones

Endocrine System Study Guide – Step-by-Step Guidance

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