Q: Which of the following equations best represents the negative feedback loop regulating thyroid hormone secretion?

$$\text{TSH} \rightarrow \text{Thyroid} \rightarrow \text{T3/T4} \rightarrow \text{Inhibition of TSH}$$

Q: Which of the following is a correct sequence for the hypothalamic-pituitary-adrenal (HPA) axis?

$$\text{Hypothalamus} \rightarrow \text{CRH} \rightarrow \text{Pituitary} \rightarrow \text{ACTH} \rightarrow \text{Adrenal Cortex} \rightarrow \text{Cortisol}$$

Question 1

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

Accepted Answer

They penetrate the cell membrane and bind to nuclear receptors, directly influencing DNA transcription.

Question 2

A patient presents with symptoms of excessive thirst and frequent urination. Laboratory tests reveal a deficiency in antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes insipidus

Question 3

Which hormone is responsible for increasing blood calcium levels by stimulating bone resorption and renal absorption?

Accepted Answer

Parathyroid hormone (PTH)

Question 4

A patient with hypersecretion of glucocorticoids from the adrenal cortex is most likely to develop which syndrome?

Accepted Answer

Cushing syndrome

Question 5

Which of the following equations best represents the negative feedback loop regulating thyroid hormone secretion?

Accepted Answer

$$	ext{TSH} ightarrow 	ext{Thyroid} ightarrow 	ext{T3/T4} ightarrow 	ext{Inhibition of TSH}$$

Question 6

Which hormone is secreted by the heart and plays a role in regulating fluid balance?

Accepted Answer

Atrial natriuretic hormone (ANH)

Question 7

A child is diagnosed with cretinism. Which gland is most likely underactive, and which hormone is deficient?

Accepted Answer

Thyroid gland; thyroxine (T4)

Question 8

Which of the following best explains why nonsteroid hormones act faster than steroid hormones?

Accepted Answer

Nonsteroid hormones bind to membrane receptors and activate second messengers, leading to rapid cellular responses.

Question 9

A patient with a pituitary tumor secreting excess prolactin (PRL) may experience which of the following symptoms?

Accepted Answer

Excessive milk production and breast development

Question 10

Which hormone is produced by the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 11

A patient with Type 2 diabetes mellitus has normal insulin secretion but elevated blood glucose. Which of the following best explains this scenario?

Accepted Answer

Insensitivity of target cells to insulin

Question 12

Which hormone is released by adipose tissue and helps regulate satiety?

Accepted Answer

Leptin

Question 13

Which of the following is a correct sequence for the hypothalamic-pituitary-adrenal (HPA) axis?

Accepted Answer

$$	ext{Hypothalamus} ightarrow 	ext{CRH} ightarrow 	ext{Pituitary} ightarrow 	ext{ACTH} ightarrow 	ext{Adrenal Cortex} ightarrow 	ext{Cortisol}$$

Question 14

Which hormone is responsible for sodium and potassium balance in the body?

Accepted Answer

Aldosterone

Question 15

A patient with Graves disease is likely to exhibit which of the following symptoms?

Accepted Answer

Accelerated metabolism and weight loss

Question 16

Which hormone is produced by the thymus and is essential for T-cell development?

Accepted Answer

Thymosin

Question 17

Which of the following best describes the effect of oxytocin during childbirth?

Accepted Answer

It triggers uterine contractions and facilitates milk ejection.

Question 18

Which of the following is a plausible outcome of target cell insensitivity to a hormone?

Accepted Answer

The hormone will have no physiological effect despite normal secretion levels.

Question 19

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

Accepted Answer

Glucagon

Question 20

Which of the following best explains why endocrine disorders often require hormone replacement therapy?

Accepted Answer

Hormones act as chemical messengers and deficiencies disrupt systemic control, requiring external supplementation.

Endocrine System: Structure, Function, and Clinical Disorders

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