Question 1

Which of the following best describes the main difference between the way the nervous system and the endocrine system transmit signals?

Accepted Answer

The nervous system sends signals directly to specific targets via axons, while the endocrine system broadcasts hormones through the bloodstream to any cell with the appropriate receptor.

Question 2

Which of the following is NOT a type of chemical signal in animals?

Accepted Answer

Exocrine

Question 3

A hormone is released into the bloodstream and acts on distant target cells. What type of signaling is this?

Accepted Answer

Endocrine signaling

Question 4

Which of the following best explains why only certain cells respond to a particular hormone?

Accepted Answer

Only those cells have the appropriate receptor for the hormone.

Question 5

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

Accepted Answer

They are lipid soluble and bind to receptors inside the target cell.

Question 6

Which of the following is a function of the endocrine system?

Accepted Answer

Maintaining homeostasis through hormone signaling

Question 7

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

Accepted Answer

It reduces hormone production and/or secretion when the desired effect is achieved.

Question 8

Which of the following is true about the difference between endocrine and exocrine glands?

Accepted Answer

Exocrine glands secrete substances onto body surfaces or into cavities via ducts, while endocrine glands secrete hormones directly into body fluids.

Question 9

Which of the following is an example of a neuroendocrine pathway?

Accepted Answer

A neuron releases a hormone into the blood, which then acts on distant target cells.

Question 10

Which of the following best describes how non-steroid hormones (such as polypeptides) affect target cells?

Accepted Answer

They bind to cell surface receptors and trigger a signal transduction cascade.

Question 11

Which of the following is a correct sequence for the thyroid hormone cascade pathway in mammals?

Accepted Answer

TRH → TSH → Thyroid hormone

Question 12

A researcher observes that a hormone triggers different responses in liver cells and muscle cells. What is the most likely explanation?

Accepted Answer

The hormone binds to different receptors or activates different signal transduction pathways in each cell type.

Question 13

Which of the following best describes the role of juvenile hormone (JH) in insect development?

Accepted Answer

Low JH levels allow ecdysone to trigger metamorphosis to the pupal and then adult stage.

Question 14

Which of the following is a correct statement about the action of steroid hormones?

Accepted Answer

Steroid hormones enter the cell, bind to intracellular receptors, and alter gene expression.

Question 15

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

Accepted Answer

A cell releases a signal that acts on itself to amplify its own response.

Question 16

Which of the following best describes the amplification of a hormonal signal in a signal transduction cascade?

Accepted Answer

A single hormone molecule can trigger the production of many second messengers, amplifying the response.

Question 17

Which of the following is a real-life example of a hormone acting via a signal transduction cascade involving cAMP?

Accepted Answer

Epinephrine binding to its receptor and activating glycogen breakdown in the liver.

Question 18

Which of the following best explains why the same hormone can have different effects in different tissues?

Accepted Answer

Different tissues may have different receptors, second messengers, or gene expression profiles.

Question 19

Which of the following is a correct description of a pheromone?

Accepted Answer

A chemical signal released into the environment that affects another individual of the same species.

Hormones and the Endocrine System: Structure, Function, and Regulation

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