Question 1

Which of the following is NOT a primary function regulated by hormones in the human body?

Accepted Answer

Voluntary muscle contraction

Question 2

Endocrinology is the study of hormones. Which of the following is a correct description of how hormones act?

Accepted Answer

Hormones are secreted by a cell or group of cells into the blood and act at very low concentrations.

Question 3

Which of the following is a correct sequence for peptide hormone synthesis and release?

Accepted Answer

Preprohormone → Prohormone → Active hormone → Release

Question 4

Steroid hormones differ from peptide hormones in their mechanism of action. Which statement best describes steroid hormone action?

Accepted Answer

Steroid hormones bind to cytoplasmic or nuclear receptors and directly regulate gene transcription.

Question 5

A patient presents with symptoms of hypercortisolism. Which of the following could be a primary pathology?

Accepted Answer

A tumor in the adrenal cortex causing excess cortisol production

Question 6

Which feedback mechanism is most dominant in complex endocrine pathways?

Accepted Answer

Negative feedback from the peripheral hormone

Question 7

A goiter can result from which of the following pathophysiological mechanisms?

Accepted Answer

Low iodine intake leading to decreased thyroid hormone synthesis and increased TSH stimulation

Question 8

Which of the following hormones is secreted by the anterior pituitary and stimulates hormone production in the liver?

Accepted Answer

Growth hormone (GH)

Question 9

Which of the following is a correct example of a hormone derived from tyrosine?

Accepted Answer

Epinephrine

Question 10

Which of the following is a plausible consequence of chronic hyperinsulinemia?

Accepted Answer

Down-regulation of insulin receptors on target cells

Question 11

Which equation best represents the relationship between hormone concentration $$[H]$$, receptor binding $$[HR]$$, and dissociation constant $$K_d$$?

Accepted Answer

$$[HR] = \frac{[H][R]}{K_d + [H]}$$

Question 12

Which of the following is a correct description of the hypothalamic-anterior pituitary pathway for thyroid hormone regulation?

Accepted Answer

TRH from the hypothalamus stimulates TSH release from the anterior pituitary, which stimulates thyroid hormone synthesis in the thyroid gland.

Question 13

Which of the following is a correct example of negative feedback in the endocrine system?

Accepted Answer

High cortisol levels suppress ACTH and CRH secretion.

Question 14

Which of the following is a plausible effect of a nonfunctional hormone receptor on target cells?

Accepted Answer

Target cells fail to respond or respond inappropriately to hormone signals.

Question 15

Which of the following is a correct statement about hormone half-life?

Accepted Answer

Steroid hormones generally have a longer half-life than peptide hormones.

Question 16

Which of the following is a correct example of a hormone with a short half-life?

Accepted Answer

Epinephrine

Question 17

Which of the following is a correct description of the role of the pineal gland?

Accepted Answer

It secretes melatonin, which is involved in the regulation of circadian rhythms.

Question 18

Which of the following is a correct example of a vestigial endocrine structure in humans?

Accepted Answer

Intermediate lobe of the pituitary gland

Question 19

Which of the following is a correct description of the effect of exogenous hormone administration?

Accepted Answer

It suppresses endogenous hormone production via negative feedback.

Introduction to the Endocrine System: Hormones and Their Regulation

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