Question 1

Which of the following best describes the primary function of the endocrine system?

Accepted Answer

Intercellular chemical communication and integration

Question 2

Which of the following is a key difference between the endocrine and nervous systems?

Accepted Answer

The endocrine system releases hormones into the bloodstream, while the nervous system releases neurotransmitters directly onto target cells

Question 3

A patient is experiencing symptoms due to a hormone that is hydrophobic and derived from cholesterol. Which hormone class is most likely involved?

Accepted Answer

Steroid hormones

Question 4

Which of the following best explains why steroid hormones can pass through the plasma membrane of target cells?

Accepted Answer

They are lipid-soluble and can diffuse through the phospholipid bilayer

Question 5

Which hormone is synthesized from the amino acid tryptophan?

Accepted Answer

Melatonin

Question 6

A hormone binds to receptors on the same cell that secreted it. This is an example of which type of signaling?

Accepted Answer

Autocrine

Question 7

Which of the following is an example of a negative feedback loop in hormone regulation?

Accepted Answer

A hormone inhibits its own secretion when physiological variables return to normal

Question 8

Which of the following best describes upregulation of hormone receptors?

Accepted Answer

An increase in the number of receptors in response to low hormone levels

Question 9

Which hormone is produced in the anterior pituitary and stimulates growth in tissues?

Accepted Answer

Growth hormone (GH)

Question 10

A patient with chronically high insulin levels develops decreased sensitivity to insulin. Which process best explains this phenomenon?

Accepted Answer

Downregulation of insulin receptors

Question 11

Which of the following is a correct sequence for the pathway of hormone action from secretion to effect?

Accepted Answer

Hormone secreted into interstitial fluid → diffuses into blood → transported to target cell → binds receptor

Question 12

Which of the following is an example of a hormonal stimulus for hormone secretion?

Accepted Answer

Thyroid-stimulating hormone (TSH) triggers thyroid hormone release

Question 13

Which of the following best describes the half-life of a hormone?

Accepted Answer

The time it takes for the plasma concentration of the hormone to decrease by half

Question 14

Which of the following hormones is NOT derived from tyrosine?

Accepted Answer

Melatonin

Question 15

Which of the following is a function of the endocrine system?

Accepted Answer

Regulation of growth and development

Question 16

Which of the following best describes a synergistic hormone interaction?

Accepted Answer

Two hormones act on the same target cell to exert the same effect

Question 17

Which of the following organs is considered a primary endocrine gland?

Accepted Answer

Thyroid gland

Question 18

Which of the following best explains why hydrophilic hormones cannot cross the plasma membrane?

Accepted Answer

They are repelled by the hydrophobic core of the phospholipid bilayer

Question 19

Which of the following is an example of a paracrine signal?

Accepted Answer

A chemical secreted into the extracellular fluid to affect nearby cells

Question 20

Which of the following best describes the effect of a hormone binding to its receptor on a target cell?

Accepted Answer

It can stimulate or inhibit a variety of cellular processes, such as enzyme activity or gene expression

The Endocrine System: Structure, Function, and Regulation

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