Q: Which of the following equations correctly represents the conversion of ATP to cAMP in the second messenger system?

$$\mathrm{ATP} \xrightarrow{\text{adenylate cyclase}} \mathrm{cAMP} + \mathrm{PP_i}$$

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 uses action potentials and neurotransmitters for rapid, short-duration responses, while the endocrine system uses hormones for slower, longer-lasting responses.

Question 2

A patient presents with symptoms of high blood glucose, increased urination, and excessive thirst. Which hormone is most likely deficient or not functioning properly, and what is the primary effect of this hormone?

Accepted Answer

Insulin; it lowers blood glucose by enhancing cellular uptake of glucose.

Question 3

Which of the following hormones is lipid-soluble and acts by directly activating genes within the target cell nucleus?

Accepted Answer

Thyroid hormone (T3/T4)

Question 4

A patient with a pituitary tumor is found to have excessive thickening of bones in the hands, feet, and face. Which hormone is most likely hypersecreted, and what is the condition called?

Accepted Answer

Growth hormone; acromegaly

Question 5

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

Accepted Answer

They bind to plasma membrane receptors and activate second messenger systems such as cAMP.

Question 6

Which of the following equations correctly represents the conversion of ATP to cAMP in the second messenger system?

Accepted Answer

$$\mathrm{ATP} \xrightarrow{	ext{adenylate cyclase}} \mathrm{cAMP} + \mathrm{PP_i}$$

Question 7

A patient is diagnosed with Addison’s disease. Which of the following symptoms would you expect to find, and which hormones are deficient?

Accepted Answer

Weight loss, dehydration, and low blood glucose; deficient glucocorticoids and mineralocorticoids

Question 8

Which of the following is an example of a humoral stimulus for hormone release?

Accepted Answer

Low blood calcium levels stimulating parathyroid hormone (PTH) release

Question 9

Which hormone is released in response to high blood osmolarity and acts to increase water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 10

A patient with Graves’ disease is likely to present with which of the following symptoms, and what is the underlying mechanism?

Accepted Answer

High metabolic rate, weight loss, and exophthalmos due to autoimmune stimulation of the thyroid gland

Question 11

Which of the following best describes the role of the hypothalamus in endocrine regulation?

Accepted Answer

It produces releasing and inhibiting hormones that control the anterior pituitary, and synthesizes hormones stored in the posterior pituitary.

Question 12

Which hormone is secreted by the adrenal medulla and what is its primary effect during the fight-or-flight response?

Accepted Answer

Epinephrine; increases heart rate and redirects blood to skeletal muscles

Question 13

Which of the following is a correct example of negative feedback regulation in the endocrine system?

Accepted Answer

Rising thyroid hormone levels inhibit the release of TSH and TRH.

Question 14

Which hormone is produced by parafollicular cells of the thyroid gland and what is its effect at high doses?

Accepted Answer

Calcitonin; inhibits osteoclast activity and increases calcium uptake into bone

Question 15

A patient with a tumor secreting excess ACTH would most likely develop which of the following conditions?

Accepted Answer

Cushing’s disease

Question 16

Which of the following best describes the permissive effect of hormones?

Accepted Answer

One hormone cannot exert its full effects without another hormone being present.

Question 17

Which hormone is secreted by the pineal gland and what is its primary function?

Accepted Answer

Melatonin; regulates sleep-wake cycles

Question 18

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 in the blood, protecting them from rapid degradation.

Question 19

A patient with hypoparathyroidism after thyroid surgery is most likely to experience which of the following symptoms?

Accepted Answer

Hypocalcemia, muscle tetany, and convulsions

Question 20

Which hormone is secreted by the heart in response to high blood pressure and what is its effect?

Accepted Answer

Atrial natriuretic peptide (ANP); increases sodium excretion and lowers blood pressure

The Endocrine System: Structure, Function, and Regulation

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