Question 1

Which of the following best describes the primary function of hormones in the endocrine system?

Accepted Answer

They act as chemical messengers that regulate the activity of target cells throughout the body.

Question 2

A patient presents with excessive thirst, frequent urination, and a craving for ice water. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes insipidus

Question 3

Which hormone is released in response to high blood glucose levels and promotes the uptake of glucose by body cells?

Accepted Answer

Insulin

Question 4

Which of the following is a correct sequence for the direct gene activation mechanism of steroid hormone action?

Accepted Answer

Hormone enters cell → Hormone binds to nuclear receptor → Hormone-receptor complex binds DNA → mRNA synthesized → New protein produced

Question 5

A patient with a history of thyroid surgery develops muscle spasms and tingling in the fingers. Blood tests show low calcium levels. Which hormone is most likely deficient?

Accepted Answer

Parathyroid hormone (PTH)

Question 6

Which of the following best explains why the endocrine system is compared to a thermostat?

Accepted Answer

It maintains homeostasis by adjusting hormone levels through negative feedback mechanisms.

Question 7

Which hormone is responsible for stimulating uterine contractions during childbirth and milk ejection during breastfeeding?

Accepted Answer

Oxytocin

Question 8

A person with hypersecretion of growth hormone during adulthood is likely to develop which condition?

Accepted Answer

Acromegaly

Question 9

Which of the following best describes the role of aldosterone?

Accepted Answer

It regulates sodium and potassium balance by acting on the kidneys.

Question 10

A patient presents with weight loss, heat intolerance, rapid heartbeat, and exophthalmos. Which endocrine disorder is most likely?

Accepted Answer

Graves’ disease

Question 11

Which of the following is a characteristic of all anterior pituitary hormones?

Accepted Answer

They are proteins or peptides and act through second-messenger systems.

Question 12

Which hormone is produced by the pineal gland and helps regulate the sleep/wake cycle?

Accepted Answer

Melatonin

Question 13

Which of the following best describes the effect of glucocorticoids such as cortisol?

Accepted Answer

They help resist long-term stress by increasing blood glucose and have anti-inflammatory effects.

Question 14

Which hormone is released by the adrenal medulla in response to neural stimulation and prepares the body for 'fight or flight'?

Accepted Answer

Epinephrine

Question 15

A patient with a history of Addison’s disease is likely to present with which of the following symptoms?

Accepted Answer

Bronze skin tone, muscle weakness, and susceptibility to infection

Question 16

Which of the following best explains the antagonistic relationship between insulin and glucagon?

Accepted Answer

Insulin decreases blood glucose while glucagon increases it.

Question 17

Which hormone is essential for the development and maturation of T-cells in the immune system?

Accepted Answer

Thymosin

Question 18

A patient with a large goiter is found to have low thyroxine (T4) levels. What is the most likely cause?

Accepted Answer

Lack of dietary iodine

Question 19

Which hormone is responsible for stimulating the development of ovarian follicles and sperm production?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 20

Which of the following best describes the effect of aging on the endocrine system?

Accepted Answer

Endocrine gland efficiency decreases, increasing the risk of diabetes, immune depression, and lower metabolic rate.

The Endocrine System: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards