Question 1

Which of the following best describes a key difference between the endocrine and nervous systems in how they control body functions?

Accepted Answer

The endocrine system uses hormones released into the bloodstream for widespread effects, while the nervous system uses neurotransmitters for localized, rapid responses.

Question 2

Which of the following is an example of a negative feedback loop in the endocrine system?

Accepted Answer

The release of insulin in response to high blood glucose, which lowers blood glucose and reduces further insulin release.

Question 3

Which hormone is released from the posterior pituitary gland in response to increased blood osmolarity, and what is its primary effect?

Accepted Answer

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

Question 4

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

Accepted Answer

The hypothalamus produces tropic hormones that travel through the hypophyseal portal system to regulate anterior pituitary hormone secretion.

Question 5

Which cell type in the thyroid gland produces calcitonin, and what is the primary effect of this hormone?

Accepted Answer

Parafollicular (C) cells; decreases blood calcium levels.

Question 6

A patient presents with symptoms of hyperthyroidism. Which of the following would you expect to find in their bloodwork?

Accepted Answer

Increased levels of thyroid hormone (T3 and T4) and decreased TSH due to negative feedback.

Question 7

Which hormone is released from the adrenal cortex in response to ACTH and is primarily responsible for increasing blood glucose levels?

Accepted Answer

Cortisol

Question 8

Which of the following best explains how the adrenal medulla is related to the sympathetic nervous system?

Accepted Answer

The adrenal medulla releases catecholamines (epinephrine and norepinephrine) directly into the bloodstream during sympathetic activation.

Question 9

Which hormone is secreted by alpha cells of the pancreas, and what is its effect on blood glucose levels?

Accepted Answer

Glucagon; increases blood glucose levels.

Question 10

A patient with Type 1 diabetes mellitus is likely to experience which of the following?

Accepted Answer

Destruction of pancreatic beta cells and hyperglycemia.

Question 11

Which hormone is released by the pineal gland, and what is its primary function?

Accepted Answer

Melatonin; regulates sleep-wake cycles.

Question 12

Which of the following best describes how insulin and glucagon work together to maintain blood glucose homeostasis?

Accepted Answer

Insulin lowers blood glucose by promoting cellular uptake, while glucagon raises blood glucose by stimulating glycogen breakdown.

Question 13

Which hormone is released by the heart in response to increased blood volume, and what is its effect?

Accepted Answer

Atrial natriuretic peptide (ANP); decreases blood pressure by promoting sodium excretion.

Question 14

Which of the following scenarios best illustrates the concept of a positive feedback loop in the endocrine system?

Accepted Answer

The release of oxytocin during labor, which intensifies uterine contractions and stimulates more oxytocin release.

Question 15

A patient is experiencing dehydration. Which hormone would you expect to be elevated, and what is its effect?

Accepted Answer

Aldosterone; increases sodium and water reabsorption in the kidneys.

Question 16

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

Accepted Answer

Erythropoietin

Question 17

Which of the following best describes the effect of parathyroid hormone (PTH) on blood calcium levels?

Accepted Answer

PTH increases blood calcium by stimulating osteoclast activity, increasing calcium reabsorption in the kidneys, and activating vitamin D.

Question 18

Which of the following is a steroid hormone produced by the adrenal cortex?

Accepted Answer

Cortisol

Question 19

Which hormone is released by the thymus gland and what is its primary function?

Accepted Answer

Thymosin; stimulates the development and maturation of T lymphocytes.

Question 20

A patient is experiencing chronic stress. Which hormone is likely to be elevated, and what is a potential long-term effect?

Accepted Answer

Cortisol; suppression of the immune system.

The Endocrine System: Structure, Function, and Regulation

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