Question 1

Which of the following best describes the difference between the endocrine and nervous systems in terms of signal transmission and duration?

Accepted Answer

Endocrine system signals are transmitted via hormones in the blood and are slower, widespread, and longer-lasting.

Question 2

A patient is given a medication that blocks phospholipase C activity. Which signal transduction pathway would be most directly affected?

Accepted Answer

DAG & IP$_3$ pathway

Question 3

Which hormone is synthesized in the hypothalamus and stored in the posterior pituitary, and is responsible for water retention?

Accepted Answer

ADH (Vasopressin)

Question 4

Steroid hormones differ from amino acid-based hormones in that they:

Accepted Answer

Are lipid-soluble, cross cell membranes, and bind to intracellular receptors to activate gene transcription.

Question 5

A patient with hyperparathyroidism is likely to have which of the following symptoms?

Accepted Answer

High blood calcium due to increased PTH.

Question 6

Which hormone is released from the zona fasciculata of the adrenal cortex and is involved in the stress response?

Accepted Answer

Cortisol

Question 7

During the ovarian cycle, which phase is characterized by a surge in LH and the release of an oocyte?

Accepted Answer

Ovulation

Question 8

A patient presents with symptoms of diabetes insipidus. Which hormone is most likely deficient?

Accepted Answer

ADH (Vasopressin)

Question 9

Which feedback mechanism is most commonly used to regulate hormone release and maintain homeostasis?

Accepted Answer

Negative feedback

Question 10

A patient with Graves' disease is likely to have which abnormality?

Accepted Answer

Hyperthyroidism due to high TSH/T$_3$/T$_4$

Question 11

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

Accepted Answer

Melatonin

Question 12

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

Accepted Answer

Decreases blood glucose by promoting cellular uptake of glucose.

Question 13

Which hormone is responsible for stimulating red blood cell production in response to low oxygen levels?

Accepted Answer

Erythropoietin (EPO)

Question 14

A patient with Cushing's syndrome is likely to have which hormonal imbalance?

Accepted Answer

Hypercortisolism

Question 15

Which hormone is released from the anterior pituitary and stimulates the thyroid gland to produce T$_3$/T$_4$?

Accepted Answer

TSH

Question 16

Which phase of the uterine cycle is characterized by the rebuilding of the endometrium under the influence of estrogen?

Accepted Answer

Proliferative phase

Question 17

A patient with SIADH (Syndrome of Inappropriate Antidiuretic Hormone) would most likely present with which of the following?

Accepted Answer

Water retention and hyponatremia

Question 18

Which hormone is produced by the zona glomerulosa of the adrenal cortex and regulates sodium reabsorption in the kidneys?

Accepted Answer

Aldosterone

Question 19

Which hormone is released from the stomach and stimulates hunger?

Accepted Answer

Ghrelin

Question 20

A patient with Addison's disease is most likely to have which hormonal abnormality?

Accepted Answer

Hypocortisolism

Endocrine System: Comprehensive Study Notes

Study Guide - Practice Questions