Q: Which of the following equations correctly represents the conversion of ATP to cAMP in the cyclic AMP second-messenger system?

$$\text{ATP} \rightarrow \text{cAMP} + \text{PP}_i$$

Q: Which of the following equations best represents the feedback regulation of hormone release?

$$\text{Hormone release} \rightarrow \text{Increased blood levels} \rightarrow \text{Inhibition of hormone release}$$

Question 1

Which of the following best describes the primary difference between the nervous system and the endocrine system in terms of response duration?

Accepted Answer

The nervous system produces short-duration responses, while the endocrine system produces long-duration responses.

Question 2

Which hormone is synthesized from cholesterol and acts on intracellular receptors to directly activate genes?

Accepted Answer

Testosterone

Question 3

Amino acid–based hormones, except thyroid hormone, exert their effects through which mechanism?

Accepted Answer

Second-messenger systems

Question 4

Which of the following equations correctly represents the conversion of ATP to cAMP in the cyclic AMP second-messenger system?

Accepted Answer

$$	ext{ATP} ightarrow 	ext{cAMP} + 	ext{PP}_i$$

Question 5

Which hormone uses the PIP$$_2-$$calcium second-messenger system to exert its effects?

Accepted Answer

Oxytocin

Question 6

What is the effect of up-regulation on target cells in response to low hormone levels?

Accepted Answer

Target cells form more receptors, increasing sensitivity.

Question 7

Which of the following best describes the mechanism of action for lipid-soluble hormones at their target cells?

Accepted Answer

They activate genes, causing synthesis of new proteins.

Question 8

A patient presents with excessive growth of hands, feet, and face as an adult. Which condition is most likely responsible, and which hormone is involved?

Accepted Answer

Acromegaly caused by high growth hormone

Question 9

Which of the following hormones is released in response to high solute concentration in the blood and targets kidney tubules to reabsorb more water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 10

Which hormone is primarily responsible for stimulating milk production in females, and what regulates its release?

Accepted Answer

Prolactin; regulated by prolactin-inhibiting hormone (PIH)

Question 11

Which of the following best describes the effect of antagonism between hormones?

Accepted Answer

One or more hormones oppose the action of another hormone.

Question 12

Which hormone is released by the anterior pituitary and stimulates the adrenal cortex to release corticosteroids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 13

Which of the following is a correct statement about the transport of steroid hormones in the blood?

Accepted Answer

Steroid hormones are bound to plasma proteins.

Question 14

Which hormone is released in response to gonadotropin-releasing hormone (GnRH) and promotes production of sex hormones in males?

Accepted Answer

Luteinizing hormone (LH)

Question 15

Which of the following equations best represents the feedback regulation of hormone release?

Accepted Answer

$$	ext{Hormone release} ightarrow 	ext{Increased blood levels} ightarrow 	ext{Inhibition of hormone release}$$

Question 16

Which hormone is released by the anterior pituitary and stimulates normal development and secretory activity of the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 17

Which of the following best describes the effect of permissiveness in hormone interactions?

Accepted Answer

One hormone cannot exert its effects without another hormone being present.

Question 18

Which hormone is released by the anterior pituitary and stimulates production of gametes?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 19

Which of the following best describes the effect of down-regulation on target cells in response to high hormone levels?

Accepted Answer

Target cells lose receptors, decreasing sensitivity.

Question 20

Which hormone is released by the posterior pituitary and acts as a strong stimulant of uterine contractions during childbirth?

Accepted Answer

Oxytocin

The Endocrine System: Structure, Function, and Hormone Regulation

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