Question 1

Which of the following best describes the main difference in how the nervous system and the endocrine system transmit signals throughout the body?

Accepted Answer

The nervous system transmits signals rapidly to specific locations using action potentials and neurotransmitters, while the endocrine system transmits signals more slowly via hormones distributed in the blood to diverse locations.

Question 2

A hormone is released by a gland and travels through the bloodstream to affect cells in distant organs. This type of signaling is best described as:

Accepted Answer

Endocrine

Question 3

Which of the following statements about hormone receptors is TRUE?

Accepted Answer

Steroid hormone receptors are typically found inside the target cell.

Question 4

Insulin is a hormone that lowers blood sugar and acts by binding to a receptor on the outside of the target cell. Based on this information, insulin is most likely:

Accepted Answer

An amino acid-based hormone because it cannot cross the cell membrane and binds to a membrane receptor.

Question 5

Which of the following best explains why steroid hormones require transport proteins in the blood?

Accepted Answer

Transport proteins stabilize steroid hormones, which are not water-soluble, allowing them to travel in the aqueous environment of blood.

Question 6

A researcher discovers a new chemical messenger that is released by a cell and acts on neighboring cells within the same tissue. This type of signaling is best classified as:

Accepted Answer

Paracrine

Question 7

Which of the following is a correct statement about the distribution of the endocrine system in the body?

Accepted Answer

Endocrine organs are distributed throughout the body, unlike most other organ systems which are typically connected or in close proximity.

Question 8

Which of the following is NOT a function controlled by hormones in the human body?

Accepted Answer

Initiating muscle contraction in response to a nerve impulse

Question 9

A patient is diagnosed with a deficiency in antidiuretic hormone (ADH). Which of the following body functions is most likely to be directly affected?

Accepted Answer

Electrolyte balance

Question 10

Which of the following best describes the mechanism by which amino acid-based hormones exert their effects on target cells?

Accepted Answer

They bind to receptors on the cell membrane, triggering a signaling cascade inside the cell.

Question 11

Which of the following is a correct pairing of hormone and its primary function?

Accepted Answer

Cortisol – increases blood sugar for stress response

Question 12

A scientist is studying a hormone that is synthesized from cholesterol, is lipid-soluble, and binds to receptors inside the target cell. Which hormone type is being described?

Accepted Answer

Steroid hormone

Question 13

Which of the following statements about hormone transport is correct?

Accepted Answer

Steroid hormones require transport proteins because they are not water-soluble.

Question 14

Which of the following best explains why the action of neurotransmitters at a synapse can sometimes be considered a form of paracrine signaling?

Accepted Answer

Neurotransmitters act on neighboring cells within the same tissue, similar to paracrine messengers.

Question 15

Which of the following is a correct statement about target cells in the endocrine system?

Accepted Answer

Target cells possess a specific receptor that binds a particular hormone.

Question 16

A hormone is released by a cell and acts on the same cell that released it. This type of signaling is called:

Accepted Answer

Autocrine

Question 17

Which of the following best describes the chemical structure and transport of amino acid-based hormones?

Accepted Answer

They are water-soluble and dissolve directly in the blood.

Question 18

Which of the following is NOT a major endocrine gland?

Accepted Answer

Spleen

Question 19

A patient has a mutation that prevents the production of transport proteins in the blood. Which hormone type would be most affected in its ability to reach target cells?

Accepted Answer

Steroid hormones

Question 20

Which of the following best explains why the stomach is not usually considered an organ of the endocrine system, even though it produces hormones like ghrelin?

Accepted Answer

While the stomach contributes to endocrine function, its primary role is not hormone secretion.

Introduction to Chemical Messengers and the Endocrine System

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