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 promoting cellular uptake of glucose.

Question 3

Which of the following hormones is lipid-soluble, can cross the plasma membrane, 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 water-soluble hormones such as peptide hormones?

Accepted Answer

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

Question 6

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 7

A patient is diagnosed with Addison’s disease, which involves hyposecretion of corticosteroids. Which symptoms would you expect to find?

Accepted Answer

Weight loss, low blood glucose, low sodium, and hyperpigmentation

Question 8

Which hormone is released from the posterior pituitary in response to increased blood osmolarity and acts on the kidneys to promote water reabsorption?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

Which of the following best describes the negative feedback regulation of thyroid hormone secretion?

Accepted Answer

Rising thyroid hormone levels inhibit TSH and TRH release.

Question 10

A patient with Graves’ disease presents with weight loss, heat intolerance, and exophthalmos. What is the underlying cause of this condition?

Accepted Answer

Autoantibodies mimic TSH, causing continuous stimulation of the thyroid gland.

Question 11

Which hormone is secreted by the adrenal cortex and is primarily responsible for sodium reabsorption and potassium excretion in the kidneys?

Accepted Answer

Aldosterone

Question 12

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

Accepted Answer

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

Question 13

A patient with a tumor secreting excess parathyroid hormone (PTH) would most likely develop which of the following complications?

Accepted Answer

Hypercalcemia and bone demineralization

Question 14

Which hormone is secreted by the pineal gland and helps regulate circadian rhythms?

Accepted Answer

Melatonin

Question 15

Which of the following is a direct effect of insulin on target cells?

Accepted Answer

Promotes glucose uptake into muscle and fat cells

Question 16

A patient is experiencing symptoms of inappropriate milk production, cessation of menses, and infertility. Which hormone is most likely hypersecreted?

Accepted Answer

Prolactin

Question 17

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.

Question 18

Which hormone is released in response to low blood oxygen levels and stimulates red blood cell production?

Accepted Answer

Erythropoietin

Question 19

Which of the following is a likely consequence of hypersecretion of adrenal medullary hormones due to a pheochromocytoma?

Accepted Answer

Hypertension, rapid heartbeat, and excessive sweating

Question 20

Which hormone is produced by the heart in response to high blood pressure and acts to decrease blood volume and pressure?

Accepted Answer

Atrial natriuretic peptide (ANP)

The Endocrine System: Structure, Function, and Regulation

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