Question 1

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

Accepted Answer

Endocrine glands release hormones directly into the bloodstream, while exocrine glands release secretions through ducts to an epithelial surface.

Question 2

A patient presents with high blood glucose levels and is diagnosed with Type 1 diabetes mellitus. Which of the following best explains the underlying cause?

Accepted Answer

The patient's pancreatic beta cells are not producing enough insulin.

Question 3

Which hormone is released in response to low blood calcium levels, and what is one of its primary effects?

Accepted Answer

Parathyroid hormone (PTH); stimulates osteoclast activity to release calcium from bone.

Question 4

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

Accepted Answer

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

Question 5

Which hormone is produced by the zona glomerulosa of the adrenal cortex, and what is its main function?

Accepted Answer

Aldosterone; increases sodium reabsorption in the kidneys.

Question 6

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

Accepted Answer

Increased secretion of glucocorticoids from the adrenal cortex.

Question 7

Which hormone is responsible for the 'fight or flight' response during the alarm phase of the general adaptation syndrome?

Accepted Answer

Epinephrine

Question 8

Which of the following best describes the permissive effect in hormone interactions?

Accepted Answer

One hormone is required for another hormone to exert its full effect.

Question 9

Which of the following is a direct effect of thyroid hormones on target cells?

Accepted Answer

Activation of genes involved in glycolysis and ATP production.

Question 10

A patient is experiencing excessive urination (polyuria) and high blood glucose levels. Which hormone is most likely deficient or ineffective?

Accepted Answer

Insulin

Question 11

Which hormone is produced by the pineal gland and what is one of its primary functions?

Accepted Answer

Melatonin; regulation of circadian rhythms.

Question 12

Which of the following best explains why a patient with hypothyroidism may experience weight gain and fatigue?

Accepted Answer

Decreased thyroid hormone levels reduce the rate of cellular metabolism.

Question 13

Which hormone is released from the posterior pituitary and is involved in water retention by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 14

Which of the following scenarios best illustrates the concept of down-regulation of hormone receptors?

Accepted Answer

A cell decreases the number of receptors in response to high hormone levels.

Question 15

Which hormone is produced by pancreatic alpha cells and what is its primary effect?

Accepted Answer

Glucagon; raises blood glucose by stimulating glycogen breakdown.

Question 16

A patient with a deficiency in parathyroid hormone (PTH) would likely experience which of the following?

Accepted Answer

Decreased blood calcium levels due to reduced calcium release from bone.

Question 17

Which of the following best describes the role of somatomedins in growth hormone function?

Accepted Answer

They mediate the effects of growth hormone by stimulating amino acid uptake and cell division.

Question 18

During the resistance phase of the general adaptation syndrome, which hormone is dominant and what is its primary metabolic effect?

Accepted Answer

Glucocorticoids; mobilization of lipids and amino acids for energy.

Question 19

Which of the following is a likely consequence of untreated diabetes mellitus?

Accepted Answer

Retinal damage leading to potential blindness.

The Endocrine System: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards