Question 1

Which of the following best describes the primary difference between the endocrine and nervous systems in terms of their mechanisms of action?

Accepted Answer

The endocrine system releases hormones into the bloodstream, resulting in slower but longer-lasting effects, while the nervous system transmits signals via neurons for rapid, short-term responses.

Question 2

A patient presents with abnormally high levels of cortisol. Which gland is most likely overactive?

Accepted Answer

Adrenal cortex

Question 3

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

Accepted Answer

Increased blood glucose stimulates insulin release, which lowers blood glucose and inhibits further insulin secretion.

Question 4

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

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 5

A tumor in the hypothalamus causes excessive secretion of corticotropin-releasing hormone (CRH). What is the likely effect on ACTH and cortisol levels?

Accepted Answer

Both ACTH and cortisol levels will increase.

Question 6

Which of the following best defines a hormone receptor?

Accepted Answer

A protein on the surface or inside a target cell that binds to a specific hormone, initiating a cellular response.

Question 7

A patient with damage to the posterior pituitary would most likely have difficulty regulating which of the following?

Accepted Answer

Water balance due to decreased antidiuretic hormone (ADH) secretion

Question 8

Which of the following is a tropic hormone?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 9

A child is diagnosed with pituitary dwarfism. Which hormone is most likely deficient?

Accepted Answer

Growth hormone (GH)

Question 10

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

Accepted Answer

They bind to intracellular receptors and directly influence gene transcription.

Question 11

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

Accepted Answer

Increased metabolic rate and weight loss

Question 12

Which of the following best explains the concept of hormone specificity?

Accepted Answer

Only target cells with the appropriate receptor can respond to a particular hormone.

Question 13

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

Accepted Answer

Low blood calcium levels stimulating parathyroid hormone release

Question 14

A patient with Type 1 diabetes mellitus is unable to produce which hormone?

Accepted Answer

Insulin

Question 15

Which of the following equations best represents the negative feedback regulation of thyroid hormones?

Accepted Answer

$$\mathrm{TRH} ightarrow \mathrm{TSH} ightarrow \mathrm{T}_3/\mathrm{T}_4} ightarrow 	ext{inhibition of TRH and TSH}$$

Question 16

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

Accepted Answer

It produces releasing and inhibiting hormones that regulate the anterior pituitary.

Question 17

A patient has low blood calcium levels. Which hormone is likely to be secreted in response, and from which gland?

Accepted Answer

Parathyroid hormone from the parathyroid glands

Question 18

Which of the following best describes the function of tropic hormones?

Accepted Answer

They stimulate other endocrine glands to secrete their hormones.

Question 19

A patient with a tumor in the adrenal medulla is likely to have elevated levels of which hormone?

Accepted Answer

Epinephrine

Question 20

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

Accepted Answer

They are hydrophilic and must bind to cell surface receptors to exert their effects.

Endocrine System: Study Guide and Key Concepts (Chapter 16)

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