Question 1

Which of the following best describes the main difference between the endocrine and nervous systems in terms of communication within the body?

Accepted Answer

The endocrine system communicates via hormones released into the bloodstream, while the nervous system communicates via neurotransmitters across synapses.

Question 2

A patient is diagnosed with hypothyroidism. Which hormone is most likely to be found at abnormally low levels in their blood?

Accepted Answer

Thyroxine ($$T_4)$$

Question 3

Which of the following is an example of a negative feedback mechanism in hormone regulation?

Accepted Answer

Increased blood glucose stimulates insulin release, which lowers blood glucose, reducing insulin secretion.

Question 4

Which hormone is produced by the anterior pituitary and stimulates the thyroid gland to release its hormones?

Accepted Answer

Thyroid-stimulating hormone ($$TSH)$$

Question 5

A patient with Addison's disease has a deficiency in which hormone, and what is a likely symptom?

Accepted Answer

Cortisol; low blood glucose

Question 6

Which of the following best describes the role of up-regulation in hormone receptor activity?

Accepted Answer

An increase in the number of hormone receptors in response to low hormone levels.

Question 7

A person is experiencing symptoms of hyperthyroidism. Which of the following lab results would you expect?

Accepted Answer

High $$T_3$$ and $$T_4$$, low $$TSH$$

Question 8

Which hormone is secreted by the pancreas and acts to increase blood glucose levels?

Accepted Answer

Glucagon

Question 9

A patient is given a synthetic analog of antidiuretic hormone ($$ADH). $$What is the expected physiological effect?

Accepted Answer

Decreased urine output due to increased water reabsorption in the kidneys

Question 10

Which of the following best explains the role of the hypothalamus in the endocrine system?

Accepted Answer

It releases hormones that regulate the activity of the pituitary gland.

Question 11

During the alarm stage of the general adaptation syndrome ($$GAS$$), which hormone is primarily released and what is its main effect?

Accepted Answer

Epinephrine; initiates the 'fight or flight' response

Question 12

Which hormone is responsible for stimulating red blood cell production in the bone marrow?

Accepted Answer

Erythropoietin ($$EPO)$$

Question 13

A patient with a tumor in the adrenal medulla is likely to have elevated levels of which hormone?

Accepted Answer

Epinephrine

Question 14

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

Accepted Answer

Parathyroid hormone ($$PTH)$$

Question 15

A patient presents with excessive urination and dehydration. Laboratory tests reveal low $$ADH$$ levels. Which condition is most likely?

Accepted Answer

Diabetes insipidus

Question 16

Which hormone is produced by the placenta and is commonly tested for in pregnancy tests?

Accepted Answer

Human chorionic gonadotropin ($$hCG)$$

Question 17

Which of the following best describes the function of oxytocin?

Accepted Answer

Stimulates uterine contractions during childbirth and milk ejection during breastfeeding

Question 18

A patient with a pituitary tumor is found to have elevated $$ACTH$$ levels. Which of the following is a likely consequence?

Accepted Answer

Increased cortisol production by the adrenal cortex

Question 19

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

Accepted Answer

Melatonin

Question 20

A patient is experiencing symptoms of hypoglycemia. Which hormone would be administered to rapidly increase their blood glucose levels?

Accepted Answer

Glucagon

Endocrine System: Communication, Hormones, and Regulation

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