Question 1

Which structure is responsible for producing thyroid hormone (TH), and what essential element is required for its synthesis?

Accepted Answer

Follicular cells; iodine

Question 2

A patient presents with bulging eyes and elevated thyroid hormone levels. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Graves disease; autoimmune antibodies mimicking TSH

Question 3

Which hormone is released in response to high blood calcium levels, and what is its primary target?

Accepted Answer

Calcitonin; osteoblasts

Question 4

What is the physiological consequence of untreated hypoparathyroidism?

Accepted Answer

Respiratory paralysis and death

Question 5

Which adrenal cortex zone produces mineralocorticoids, and what is the major hormone in this group?

Accepted Answer

Zona glomerulosa; aldosterone

Question 6

A patient with Cushing's disease will most likely have which hormonal imbalance and symptoms?

Accepted Answer

Hypersecretion of cortisol; muscle loss and high blood pressure

Question 7

Which hormone is released by the adrenal medulla during a 'fight or flight' response, and what is its effect on the heart?

Accepted Answer

Epinephrine; increases heart rate

Question 8

What is the main difference between Type 1 and Type 2 diabetes mellitus?

Accepted Answer

Type 1 is caused by autoimmune destruction of beta cells; Type 2 by insulin resistance

Question 9

Which hormone is produced by the pineal gland, and what disorder is associated with its excess during winter months?

Accepted Answer

Melatonin; Seasonal Affective Disorder (SAD)

Question 10

Which hormone is responsible for stimulating the uptake of glucose by skeletal muscle and fat cells?

Accepted Answer

Insulin

Question 11

What is the effect of aldosterone on kidney function, and how does this impact blood pressure?

Accepted Answer

Increases sodium reabsorption, increasing blood pressure

Question 12

Which hormone counteracts the action of calcitonin, and what is its effect on bone tissue?

Accepted Answer

Parathyroid hormone; stimulates osteoclasts to break down bone

Question 13

A patient with hyperparathyroidism is likely to experience which symptoms?

Accepted Answer

Fragile bones and kidney stones

Question 14

Which hormone is produced by beta cells in the pancreas, and what is its primary function?

Accepted Answer

Insulin; decreases blood glucose

Question 15

Which hormone is responsible for the development of secondary sex characteristics and sperm production in males?

Accepted Answer

Testosterone

Question 16

Which hormone is released in response to low blood glucose levels, and what is its primary target organ?

Accepted Answer

Glucagon; liver

Question 17

Which hormone produced by the adrenal cortex is involved in stress resistance and increases blood glucose by breaking down protein and fat?

Accepted Answer

Cortisol

Question 18

What is the main function of estrogen and progesterone produced by the ovaries?

Accepted Answer

Development of secondary sex characteristics and regulation of menstrual cycle

Question 19

Which hormone is secreted by parafollicular cells of the thyroid, and what is its effect on blood calcium levels?

Accepted Answer

Calcitonin; decreases blood calcium

Question 20

Which hormone is involved in the body's daily rhythm and is associated with symptoms of depression and lethargy during winter months?

Accepted Answer

Melatonin

Endocrine System: Glands, Hormones, and Regulation

Study Guide - Practice Questions