Question 1

Which of the following best describes the difference between endocrine and neurosecretory cells in hormone signaling?

Accepted Answer

Endocrine cells release hormones into the bloodstream, while neurosecretory cells release hormones from neurons into the bloodstream.

Question 2

A patient is diagnosed with hypothyroidism. Which of the following symptoms is most likely to be observed, and what is the underlying hormonal mechanism?

Accepted Answer

Weight gain and intolerance to cold due to decreased levels of $$T_3$$ and $$T_4.$$

Question 3

Which of the following hormones is secreted by the adrenal medulla and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 4

A researcher blocks all plasma membrane receptors in a target cell. Which hormone would most likely still be able to exert its effects?

Accepted Answer

Estrogen

Question 5

Which of the following best explains why steroid hormones can directly affect gene expression in target cells?

Accepted Answer

Steroid hormones are lipid-soluble and bind to intracellular receptors that act as transcription factors.

Question 6

A person is given a drug that inhibits the synthesis of prostaglandins. Which of the following effects is most likely to occur?

Accepted Answer

Reduced inflammation and pain

Question 7

Which of the following is an example of negative feedback in endocrine regulation?

Accepted Answer

High levels of $$T_3$$ and $$T_4$$ inhibit the release of TSH from the anterior pituitary.

Question 8

Which hormone is responsible for lowering blood glucose levels, and what is its mechanism of action?

Accepted Answer

Insulin; stimulates cells to take up glucose and store it as glycogen.

Question 9

A patient with type 1 diabetes is unable to produce sufficient insulin. Which of the following best describes the underlying cause?

Accepted Answer

Autoimmune destruction of pancreatic beta cells

Question 10

Which of the following best describes the role of the hypothalamus in the endocrine system?

Accepted Answer

It acts as the master control center, regulating the pituitary gland.

Question 11

Which of the following is a correct sequence of events for a peptide hormone signaling pathway?

Accepted Answer

Hormone binds to plasma membrane receptor $$\rightarrow$$ signal transduction pathway $$\rightarrow$$ cellular response

Question 12

Which of the following best explains why a small amount of hormone can have a large effect on target cells?

Accepted Answer

Signal transduction pathways amplify the signal inside the cell.

Question 13

Which hormone is secreted by the anterior pituitary and stimulates the thyroid gland?

Accepted Answer

TSH (Thyroid-stimulating hormone)

Question 14

Which of the following is a function of glucocorticoids released from the adrenal cortex?

Accepted Answer

Promote glucose synthesis and reduce inflammation

Question 15

Which of the following best describes the effect of environmental hormones (endocrine disruptors) on animal physiology?

Accepted Answer

They can mimic or block natural hormones, disrupting normal endocrine function.

Question 16

Which hormone is primarily responsible for stimulating milk production in mammals, and what is a key regulatory mechanism?

Accepted Answer

Prolactin; positive feedback from suckling increases its release.

Question 17

Which of the following best explains why testosterone is associated with aggressive behavior in some species but not others?

Accepted Answer

The effect of testosterone on aggression depends on species-specific neural circuits and social context.

Question 18

Which of the following is a correct statement about the regulation of blood calcium levels?

Accepted Answer

Parathyroid hormone increases blood calcium by stimulating calcium release from bones.

Question 19

A patient with an adrenal cortex tumor is found to have high blood pressure and elevated blood glucose. Which hormone is most likely overproduced?

Accepted Answer

Cortisol

Question 20

Which of the following best describes the role of releasing and inhibiting hormones from the hypothalamus?

Accepted Answer

They regulate the secretion of hormones from the anterior pituitary.

Hormones and the Endocrine System: Regulation and Homeostasis

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