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

$$\text{Hormone} \rightarrow \text{GPCR} \rightarrow \text{G protein} \rightarrow \text{Adenylyl cyclase} \rightarrow \text{cAMP} \rightarrow \text{Protein kinase}$$

Question 1

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

Accepted Answer

The nervous system uses action potentials and neurotransmitters for rapid, localized signaling, while the endocrine system uses hormones for slower, widespread signaling.

Question 2

A hormone is released into the bloodstream and affects distant target cells. This type of signaling is best described as:

Accepted Answer

Endocrine

Question 3

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

Accepted Answer

Cortisol – increases blood sugar during stress

Question 4

Steroid hormones require a transport protein in the blood because:

Accepted Answer

They are lipid-soluble and do not travel easily in the aqueous environment of blood.

Question 5

Which of the following hormones is NOT released by the anterior pituitary gland?

Accepted Answer

Oxytocin

Question 6

A patient has a tumor that causes excess secretion of antidiuretic hormone (ADH). Which of the following symptoms would you expect?

Accepted Answer

Water retention and concentrated urine

Question 7

Which of the following best explains why second messenger systems can produce large cellular responses to small amounts of hormone?

Accepted Answer

Second messenger systems amplify the signal at multiple steps, so one hormone molecule can activate many intracellular molecules.

Question 8

Which hormone is derived from tryptophan and helps regulate circadian rhythms?

Accepted Answer

Melatonin

Question 9

Which of the following statements about hormone receptors is correct?

Accepted Answer

Steroid hormones bind to intracellular receptors, while most amino acid-based hormones bind to membrane-bound receptors.

Question 10

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

Accepted Answer

It carries tropic hormones directly from the hypothalamus to the anterior pituitary.

Question 11

Amino acid-based hormones typically exert their effects through which of the following mechanisms?

Accepted Answer

Activation of membrane-bound receptors and second messenger systems

Question 12

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

Accepted Answer

$$	ext{Hormone} ightarrow 	ext{GPCR} ightarrow 	ext{G protein} ightarrow 	ext{Adenylyl cyclase} ightarrow 	ext{cAMP} ightarrow 	ext{Protein kinase}$$

Question 13

Which of the following hormones is released in response to low blood calcium levels?

Accepted Answer

Parathyroid hormone (PTH)

Question 14

A researcher blocks all G protein-coupled receptors (GPCRs) in a cell. Which hormone signaling pathway would be most directly affected?

Accepted Answer

cAMP second messenger pathway

Question 15

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

Accepted Answer

Different tissues have different receptors or signaling pathways for the same hormone.

Question 16

Which hormone is primarily responsible for stimulating the release of cortisol from the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 17

Which of the following is a correct statement about the difference between anterior and posterior pituitary glands?

Accepted Answer

The posterior pituitary releases hormones made in the hypothalamus.

Question 18

Which of the following best describes the effect of blocking the hypothalamus on the anterior pituitary?

Accepted Answer

Anterior pituitary hormone release would decrease due to loss of hypothalamic releasing hormones.

Question 19

Which of the following is NOT a function of hormones?

Accepted Answer

Initiation of muscle contraction via action potentials

Anatomy & Physiology: The Endocrine System – Study Guide and Step-by-Step Guidance

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