Q: Which of the following equations correctly represents the amplification of a signal in the cAMP second messenger system?

$$\text{Hormone} + \text{Receptor} \rightarrow \text{G-protein activation} \rightarrow \text{Adenylate cyclase} \rightarrow \text{cAMP} \rightarrow \text{Protein kinases} \rightarrow \text{Amplified cellular response}$$

Question 1

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands release hormones directly into the bloodstream, whereas exocrine glands secrete substances into ducts that lead to body surfaces or cavities.

Question 2

Amino acid-based hormones are generally hydrophilic. Where are their receptors most likely located?

Accepted Answer

On the plasma membrane of target cells.

Question 3

Which hormone is released from the posterior pituitary and acts to increase water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 4

A patient presents with symptoms of hyperglycemia. Which hormone is most likely deficient, and what is the condition called?

Accepted Answer

Insulin; Type I Diabetes Mellitus

Question 5

Which of the following is a correct sequence for the adenylate cyclase cAMP second messenger system?

Accepted Answer

Hormone binds receptor → G-protein activated → Adenylate cyclase produces cAMP → cAMP activates protein kinases

Question 6

Steroid hormones, such as cortisol, exert their effects by:

Accepted Answer

Binding to intracellular receptors and directly activating gene transcription.

Question 7

Which of the following is an example of hormonal regulation of hormone secretion?

Accepted Answer

The release of thyroid stimulating hormone (TSH) from the anterior pituitary in response to thyrotropin-releasing hormone (TRH) from the hypothalamus.

Question 8

A patient with Graves’ disease is experiencing hyperthyroidism. Which hormone is being hypersecreted?

Accepted Answer

Thyroxine (T4)

Question 9

Which hormone is released in response to low blood calcium levels and acts to increase calcium concentration?

Accepted Answer

Parathyroid hormone (PTH)

Question 10

Which of the following best describes the relationship between the hypothalamus and the anterior pituitary?

Accepted Answer

The hypothalamus communicates with the anterior pituitary via the hypothalamic-hypophyseal portal system.

Question 11

A patient with Cushing’s syndrome is likely to have which of the following hormonal imbalances?

Accepted Answer

Hypersecretion of cortisol

Question 12

Which hormone is released from the adrenal medulla in response to neural stimulation and is involved in the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 13

Which of the following equations correctly represents the amplification of a signal in the cAMP second messenger system?

Accepted Answer

$$	ext{Hormone} + 	ext{Receptor} ightarrow 	ext{G-protein activation} ightarrow 	ext{Adenylate cyclase} ightarrow 	ext{cAMP} ightarrow 	ext{Protein kinases} ightarrow 	ext{Amplified cellular response}$$

Question 14

A patient with pituitary dwarfism is most likely experiencing:

Accepted Answer

Hyposecretion of growth hormone during childhood

Question 15

Which hormone is released from the pancreas in response to low blood glucose levels, and what is its primary effect?

Accepted Answer

Glucagon; stimulates glycogen breakdown in the liver to increase blood glucose

Question 16

Which of the following is a correct example of humoral regulation of hormone secretion?

Accepted Answer

Release of parathyroid hormone in response to low blood calcium levels

Question 17

Which hormone is secreted by the anterior pituitary and stimulates the adrenal cortex to release its hormones?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 18

A patient with Addison’s disease is most likely experiencing:

Accepted Answer

Hyposecretion of cortisol and aldosterone

Question 19

Which hormone is released from the testes and is responsible for the development of male secondary sex characteristics?

Accepted Answer

Testosterone

Question 20

Which of the following best describes the mechanism of direct gene activation by steroid hormones?

Accepted Answer

Steroid hormone diffuses into cell → binds intracellular receptor → hormone-receptor complex enters nucleus → activates specific genes

Chapter 16: The Endocrine System – Structure, Function, and Regulation

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