Question 1

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

Accepted Answer

The nervous system uses neurotransmitters for rapid, short-duration responses at specific locations, while the endocrine system uses hormones for slower, longer-duration responses at diffuse locations.

Question 2

A patient is experiencing symptoms of low blood calcium. Which type of hormonal stimulus is most likely responsible for the release of parathyroid hormone in this scenario?

Accepted Answer

Humoral stimulus

Question 3

Which of the following statements about steroid hormones is correct?

Accepted Answer

Steroid hormones are lipid-soluble, cross the plasma membrane, and bind to intracellular receptors.

Question 4

Amino acid-based hormones differ from steroid hormones in which of the following ways?

Accepted Answer

Amino acid-based hormones are water-soluble and act on receptors in the plasma membrane.

Question 5

Which of the following best explains the concept of 'up-regulation' in hormone receptor dynamics?

Accepted Answer

An increase in the number of hormone receptors due to prolonged low hormone levels.

Question 6

A patient is given a drug that blocks G protein-coupled receptors. Which class of hormones would be most affected by this drug?

Accepted Answer

Water-soluble hormones

Question 7

Which of the following is an example of a hormone acting via a second messenger system?

Accepted Answer

Insulin binding to a membrane receptor and activating $$cAMP as a $$second messenger

Question 8

Which of the following best describes the role of negative feedback in hormone regulation?

Accepted Answer

It maintains homeostasis by reducing hormone secretion when levels are adequate.

Question 9

A researcher observes that the combined effect of glucagon and epinephrine on liver glucose release is greater than the sum of their individual effects. This is an example of which type of hormone interaction?

Accepted Answer

Synergism

Question 10

Which of the following best explains why ACTH (adrenocorticotropic hormone) only affects the adrenal cortex and not other tissues?

Accepted Answer

Only adrenal cortex cells have receptors specific for ACTH.

Question 11

A patient with a pituitary tumor is found to have abnormally high levels of a hormone that stimulates the thyroid gland. Which hormone is most likely elevated?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 12

Which of the following is a correct sequence of events for direct gene activation by a steroid hormone?

Accepted Answer

Hormone diffuses through plasma membrane → binds intracellular receptor → hormone-receptor complex enters nucleus → binds DNA → initiates transcription

Question 13

Which of the following best describes the function of the posterior pituitary gland?

Accepted Answer

It stores and releases neurohormones produced by the hypothalamus.

Question 14

A patient has a genetic mutation that prevents the formation of protein carriers in the blood. Which type of hormone would be most affected in its ability to circulate?

Accepted Answer

Steroid hormones

Question 15

Which of the following is an example of permissiveness in hormone action?

Accepted Answer

Thyroid hormone is required for reproductive hormones to exert their effects.

Question 16

Which of the following best describes the action of eicosanoids?

Accepted Answer

They mediate inflammation and allergic reactions, and their effects are highly localized.

Question 17

A patient is found to have a deficiency in cAMP production in their cells. Which of the following hormone actions would be most directly impaired?

Accepted Answer

Water-soluble hormone signaling via membrane receptors

Question 18

Which of the following best explains why hormone concentration in the blood is not the only factor determining the strength of a hormone's effect on a target cell?

Accepted Answer

The number of receptors and the affinity of the hormone for its receptor also play a role.

Question 19

A patient is given a drug that increases the rate at which hormones are inactivated and removed from the blood. What is the most likely effect on hormone action?

Accepted Answer

Hormone effects will be diminished due to decreased availability.

Question 20

Which of the following is a correct example of an autocrine signal?

Accepted Answer

A chemical signal affecting the same cell that secreted it.

Endocrine System: Hormones, Glands, and Mechanisms of Action

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