Question 1

Which of the following best describes the primary difference between the endocrine and nervous systems in terms of control and response time?

Accepted Answer

The endocrine system uses hormones released into the bloodstream for slower, longer-lasting responses, while the nervous system uses electrical and chemical signals for rapid, short-lived responses.

Question 2

A patient presents with abnormally high levels of a hormone in their blood. Which regulatory mechanism is most likely impaired?

Accepted Answer

Negative feedback regulation

Question 3

Which of the following is TRUE regarding water-soluble hormones?

Accepted Answer

They bind to plasma membrane receptors and act through second messengers.

Question 4

Which equation correctly represents the formation of cyclic AMP (cAMP) from ATP?

Accepted Answer

$ATP \xrightarrow{Adenylate\ Cyclase} cAMP + PP_i$

Question 5

A cell's response to a hormone depends on which of the following factors?

Accepted Answer

The number of receptors on/in the target cell, the affinity of the receptor for the hormone, and the blood hormone level

Question 6

Which of the following best explains the mechanism of action for lipid-soluble hormones?

Accepted Answer

They diffuse through the plasma membrane, bind to intracellular receptors, and directly activate gene transcription.

Question 7

Which of the following is NOT a major endocrine gland?

Accepted Answer

Spleen

Question 8

A patient with persistently low hormone levels is found to have increased receptor numbers on their target cells. This is an example of:

Accepted Answer

Up-regulation

Question 9

Which of the following hormones is secreted by the anterior pituitary and regulates the secretion of other hormones?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 10

Which of the following best describes the role of the hypothalamic-pituitary portal system?

Accepted Answer

It transports hypothalamic releasing and inhibiting hormones directly to the anterior pituitary via blood vessels.

Question 11

Which of the following is a correct sequence for the cAMP second messenger pathway?

Accepted Answer

Hormone binds to plasma membrane receptor → activation of adenylate cyclase → conversion of ATP to cAMP → activation of protein kinases

Question 12

Which of the following is a tropic hormone produced by the anterior pituitary?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 13

Which of the following best explains why steroid hormones generally have longer half-lives than peptide hormones?

Accepted Answer

Steroid hormones are bound to plasma proteins, which protect them from rapid degradation.

Question 14

Which of the following is an example of a hormone acting via the phospholipase C pathway?

Accepted Answer

Activation of protein kinase C via DAG and release of Ca$^{2+}$ from intracellular stores

Question 15

Which of the following best describes the effect of hormone-receptor affinity on cellular response?

Accepted Answer

Higher affinity increases the likelihood and magnitude of cellular response to a hormone.

Question 16

Which of the following is a correct description of the negative feedback mechanism in endocrine regulation?

Accepted Answer

Hormone effects on target organs inhibit further hormone release, maintaining homeostasis.

Question 17

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

Accepted Answer

Only cells with specific receptors for that hormone can respond.

Question 18

Which of the following is a correct statement about hormone half-life?

Accepted Answer

It is the time required for the concentration of the hormone in the blood to decrease by half.

Question 19

Which of the following best describes the role of the posterior pituitary?

Accepted Answer

It stores and releases neurohormones produced by the hypothalamus.

Introduction to the Endocrine System – ANP 1105A Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards