Question 1

Which of the following best describes the main difference between the nervous system and the endocrine system in terms of signal transmission?

Accepted Answer

The nervous system transmits signals via electrical impulses along specific pathways (like a telephone wire), while the endocrine system broadcasts chemical signals (hormones) through the bloodstream (like a radio signal).

Question 2

Which of the following is NOT a type of animal chemical signal?

Accepted Answer

Exocrine

Question 3

A hormone is released into the bloodstream and acts on distant target cells. Which category of chemical signal does this describe?

Accepted Answer

Endocrine

Question 4

Which of the following statements about steroid hormones is CORRECT?

Accepted Answer

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

Question 5

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

Accepted Answer

Only those cells have the specific receptor for that hormone.

Question 6

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

Accepted Answer

TRH → TSH → Thyroid hormone

Question 7

A researcher observes that a hormone triggers different responses in liver cells and blood vessel cells. What is the most likely explanation for this phenomenon?

Accepted Answer

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

Question 8

Which of the following is TRUE regarding the action of non-steroid hormones?

Accepted Answer

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

Question 9

Which of the following best describes the role of cyclic adenosine monophosphate (cAMP) in hormone signaling?

Accepted Answer

cAMP is a second messenger that amplifies the signal inside the cell after hormone binding.

Question 10

Which of the following is a correct description of the neuroendocrine-to-endocrine pathway?

Accepted Answer

A neural signal stimulates an endocrine cell to release a hormone, which then acts on an effector cell.

Question 11

Which of the following is NOT a function of the endocrine system?

Accepted Answer

Transmitting high-speed electrical impulses

Question 12

Which of the following best describes the effect of high levels of juvenile hormone (JH) in insect development?

Accepted Answer

Ecdysone surges only induce juvenile growth by molting.

Question 13

Which of the following is a key structural feature that distinguishes steroid hormones from other hormone types?

Accepted Answer

They have a four-ring lipid structure.

Question 14

A mutation prevents the formation of the zinc finger region in a steroid hormone receptor. What is the most likely consequence?

Accepted Answer

The hormone-receptor complex cannot bind DNA, so gene expression changes will not occur.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best explains why the same hormone can produce different effects in different target cells?

Accepted Answer

Different target cells may have different receptors, second messengers, or amplification steps.

Question 17

During amphibian metamorphosis, which hormone is primarily responsible for triggering the transformation from tadpole to adult frog?

Accepted Answer

Triiodothyronine ($$T_3)$$

Question 18

Which of the following is TRUE about exocrine glands?

Accepted Answer

They convey their products via ducts to body surfaces or cavities.

Question 19

Which of the following best describes the process by which a steroid hormone alters gene expression?

Accepted Answer

It enters the target cell, binds to an intracellular receptor, and the hormone-receptor complex binds to DNA at hormone-response elements to regulate transcription.

Question 20

Which of the following is a correct statement about the integration of the nervous and endocrine systems?

Accepted Answer

Endocrine signals can modulate electrical signals transmitted by the nervous system.

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

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