Question 1

Which of the following best describes the main difference between endocrine and nervous system signaling?

Accepted Answer

Endocrine signaling uses hormones that travel through the bloodstream to target cells, while nervous signaling uses neurons to transmit signals along dedicated pathways.

Question 2

Which of the following is a correct example of a local regulator and its function?

Accepted Answer

Nitric oxide (NO), which causes vasodilation by relaxing smooth muscle cells.

Question 3

A hormone binds to a receptor on the plasma membrane of a liver cell, triggering a cascade that leads to the breakdown of glycogen into glucose. Which hormone is most likely responsible for this response?

Accepted Answer

Epinephrine

Question 4

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 or signal transduction pathways for the same hormone.

Question 5

Which of the following is a correct sequence for a simple endocrine pathway regulating pH in the duodenum?

Accepted Answer

Low pH in duodenum → secretion of secretin → pancreas releases bicarbonate → pH increases

Question 6

Which hormone is released by the posterior pituitary and is directly involved in regulating water balance in the body?

Accepted Answer

Antidiuretic hormone (ADH)

Question 7

A patient has abnormally high blood calcium levels. Which hormone is most likely being secreted in excess?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

Which of the following best describes the role of the adrenal medulla during the 'fight-or-flight' response?

Accepted Answer

It releases epinephrine and norepinephrine, increasing heart rate and blood flow to muscles.

Question 9

Which of the following is a correct statement about hormone chemical classes?

Accepted Answer

Most amine hormones are water-soluble and bind to receptors on the cell surface.

Question 10

Which hormone is primarily responsible for the development of male secondary sex characteristics?

Accepted Answer

Testosterone

Question 11

A researcher blocks the action of tropic hormones from the anterior pituitary. Which of the following effects is most likely to occur?

Accepted Answer

The thyroid gland will not release thyroid hormone in response to low blood levels.

Question 12

Which of the following best describes the feedback regulation of oxytocin during childbirth?

Accepted Answer

Positive feedback: oxytocin release increases in response to uterine contractions.

Question 13

Which hormone is secreted by the pineal gland and is involved in regulating biological rhythms?

Accepted Answer

Melatonin

Question 14

Which of the following is a correct example of a hormone cascade pathway?

Accepted Answer

Hypothalamus releases TRH → anterior pituitary releases TSH → thyroid gland releases thyroid hormone

Question 15

Which of the following best explains why steroid hormones typically have longer-lasting effects than water-soluble hormones?

Accepted Answer

Steroid hormones activate gene transcription, leading to changes in protein synthesis.

Question 16

A patient is unable to produce sufficient antidiuretic hormone (ADH). Which of the following symptoms would you expect?

Accepted Answer

Excessive urination and dehydration

Question 17

Which of the following is a function of paracrine signaling?

Accepted Answer

Regulating blood pressure by acting on nearby smooth muscle cells

Question 18

Which of the following best describes the role of glucocorticoids released by the adrenal cortex?

Accepted Answer

They influence glucose metabolism and suppress the immune system.

Question 19

Which hormone is primarily responsible for stimulating the production of egg yolk in female birds and frogs?

Accepted Answer

Estradiol

Question 20

Which of the following best describes the function of melanocyte-stimulating hormone (MSH) in mammals?

Accepted Answer

It plays roles in hunger, metabolism, and coloration.

Hormones and the Endocrine System: Chapter 45 Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards