Question 1

Which of the following best describes the main function of the endocrine system?

Accepted Answer

To secrete hormones into the blood to regulate physiological processes

Question 2

Which structure is NOT typically considered part of the endocrine system?

Accepted Answer

Sweat gland

Question 3

A hormone is best defined as:

Accepted Answer

A chemical messenger released into the blood that affects distant target cells

Question 4

Which of the following is a key difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the blood; exocrine glands secrete substances into ducts

Question 5

When comparing the endocrine and nervous systems, which statement is most accurate?

Accepted Answer

The endocrine system provides slower, longer-lasting effects than the nervous system

Question 6

A patient presents with excessive urination and thirst. Laboratory tests show low levels of antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes Insipidus

Question 7

Which of the following is NOT a way hormones are released into the blood?

Accepted Answer

Mechanical filtration

Question 8

Homeostasis is best defined as:

Accepted Answer

The maintenance of a stable internal environment

Question 9

Which of the following correctly matches the class of hormone with its characteristic?

Accepted Answer

Peptide hormones are water-soluble and bind to cell surface receptors

Question 10

Which hormone is considered a tropic hormone?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 11

Which statement best describes the difference between autocrine, paracrine, and endocrine hormones?

Accepted Answer

Autocrine hormones act on the same cell that secreted them; paracrine hormones act on nearby cells; endocrine hormones act on distant cells via the bloodstream

Question 12

Which hormone increases blood calcium levels by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 13

A patient has low blood calcium. Which hormone would be expected to increase in response?

Accepted Answer

Parathyroid hormone (PTH)

Question 14

Which tissue type is primarily involved in communication between the hypothalamus and the posterior pituitary?

Accepted Answer

Nervous tissue

Question 15

Which of the following best explains how the hypothalamus communicates with the anterior pituitary?

Accepted Answer

By releasing hormones into the hypophyseal portal system

Question 16

Which region of the adrenal gland is responsible for secreting cortisol?

Accepted Answer

Zona fasciculata of the adrenal cortex

Question 17

Which hormone is secreted by the adrenal medulla and is primarily regulated by neural input?

Accepted Answer

Epinephrine

Question 18

A patient with Addison's disease has damage to the adrenal cortex. Which hormone would most likely be deficient?

Accepted Answer

Cortisol

Question 19

Which equation best represents the negative feedback regulation of blood calcium by parathyroid hormone (PTH)?

Accepted Answer

$$\Delta [Ca$$^{2+}$$] = PTH_{secreted} - Calcitonin_{secreted}$$

Question 20

A patient is experiencing symptoms of hyperglycemia. Which hormone is most likely deficient?

Accepted Answer

Insulin

Endocrine System: Structure, Function, and Hormonal Regulation

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