Question 1

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands release their products onto epithelial surfaces via ducts.

Question 2

A patient presents with symptoms of hypercalcemia (elevated blood calcium). Which hormone is most likely underproduced, and what is its normal function?

Accepted Answer

Calcitonin; it lowers blood calcium by inhibiting osteoclast activity.

Question 3

Which of the following is a correct pairing of a hormone with its primary source and effect?

Accepted Answer

Melatonin – pineal gland – regulates circadian rhythms

Question 4

Which chemical class of hormones is most likely to bind to intracellular receptors and directly influence gene expression?

Accepted Answer

Steroid hormones

Question 5

A patient with a pituitary tumor is experiencing excessive growth during childhood. Which hormone is most likely overproduced, and what is the resulting condition called?

Accepted Answer

Growth hormone (GH); gigantism

Question 6

Which of the following best describes the mechanism of action for peptide hormones?

Accepted Answer

They bind to cell surface receptors and activate second messenger systems such as cyclic AMP ($$cAMP).$$

Question 7

Which hormone is released by the posterior pituitary and is responsible for stimulating uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 8

A patient with type 1 diabetes mellitus is unable to produce which hormone, and what is the primary effect of this hormone?

Accepted Answer

Insulin; lowers blood glucose by promoting cellular uptake of glucose

Question 9

Which of the following scenarios best illustrates a paracrine effect?

Accepted Answer

A cell releases a chemical messenger that acts on neighboring cells within the same tissue.

Question 10

Which hormone is produced by the adrenal medulla and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 11

A patient is found to have low levels of thyroid hormones (T3 and T4). Which of the following symptoms is most likely to be observed?

Accepted Answer

Decreased metabolic rate and weight gain

Question 12

Which hormone is secreted by the heart and helps to lower blood pressure by increasing sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 13

Which of the following best describes the relationship between the hypothalamus and the anterior pituitary gland?

Accepted Answer

The hypothalamus releases releasing and inhibiting hormones into the hypophyseal portal system to regulate anterior pituitary hormone secretion.

Question 14

Which hormone is produced by the kidneys and stimulates red blood cell production in the bone marrow?

Accepted Answer

Erythropoietin

Question 15

Which hormone is primarily responsible for the development of secondary sexual characteristics in males?

Accepted Answer

Testosterone

Question 16

A patient with Cushing's syndrome is likely to have an excess of which hormone, and what is a common symptom?

Accepted Answer

Cortisol; muscle wasting and central obesity

Question 17

Which of the following is a function of the hormone produced by adipose tissue?

Accepted Answer

Leptin; signals satiety to the hypothalamus to regulate appetite

Question 18

Which hormone is produced by the placenta and is essential for maintaining pregnancy?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 19

Where are enteroendocrine cells primarily located, and what is their function?

Accepted Answer

In the gastrointestinal tract; they secrete hormones that regulate digestion.

Question 20

A patient is experiencing dehydration due to excessive water loss in urine. Which hormone is most likely deficient, and what is its normal effect?

Accepted Answer

Antidiuretic hormone (ADH); increases water reabsorption in the kidneys

BIO 201 Chapter 16: The Endocrine System - Comprehensive Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards