Question 1

Which of the following best describes a key difference between the endocrine and nervous systems in terms of signal transmission?

Accepted Answer

The endocrine system transmits signals via hormones in the bloodstream, while the nervous system transmits signals via neurons.

Question 2

A patient is given a drug that blocks all G protein-coupled receptors. Which hormone signaling pathway would be most directly affected?

Accepted Answer

Second messenger systems such as $$cAMP$$

Question 3

Which of the following is NOT an endocrine gland?

Accepted Answer

Salivary gland

Question 4

Amino acid-based hormones exert their effects primarily through which mechanism?

Accepted Answer

Second messenger systems

Question 5

A hormone that is released in response to another hormone is an example of:

Accepted Answer

Hormonal stimulus

Question 6

Which hormone type can pass through the cell membrane to act on intracellular receptors?

Accepted Answer

Steroid hormones

Question 7

The anterior pituitary is controlled by hormones from the:

Accepted Answer

Hypothalamus

Question 8

Negative feedback in the endocrine system:

Accepted Answer

Maintains homeostasis

Question 9

The adrenal medulla releases hormones in response to:

Accepted Answer

Neural stimulation

Question 10

Which of the following statements is TRUE about hormone receptors?

Accepted Answer

They determine the target cell's response

Question 11

A patient with a tumor in the anterior pituitary is found to have elevated levels of cortisol. Which feedback mechanism is most likely impaired?

Accepted Answer

Negative feedback from cortisol on the hypothalamus and pituitary

Question 12

Which of the following best illustrates a positive feedback mechanism in the endocrine system?

Accepted Answer

Oxytocin release during childbirth contractions

Question 13

A patient is experiencing symptoms of hypothyroidism. Which hormone would you expect to be elevated due to negative feedback?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 14

Which of the following is an example of a humoral stimulus for hormone release?

Accepted Answer

Rising blood glucose triggering insulin release

Question 15

A researcher blocks all protein synthesis in a cell. Which hormone's action would be most directly affected?

Accepted Answer

Steroid hormones

Question 16

Which of the following best describes the action of second messenger systems?

Accepted Answer

Hormones bind to cell surface receptors, activating intracellular signaling cascades such as $$cAMP$$

Question 17

A patient with Addison's disease has low levels of aldosterone. Which of the following would you expect as a result?

Accepted Answer

Decreased blood sodium and increased potassium

Question 18

Which of the following is a characteristic of steroid hormones?

Accepted Answer

They bind to receptors inside the target cell

Question 19

A sudden drop in blood calcium levels triggers the release of parathyroid hormone. This is an example of:

Accepted Answer

Humoral stimulus

Question 20

Which of the following best explains why the effects of the endocrine system are generally longer lasting than those of the nervous system?

Accepted Answer

Hormones circulate in the blood and can affect target cells for minutes to hours

Endocrine System Physiology: Study Notes

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