Question 1

Which of the following best describes the main difference between the endocrine and nervous systems in terms of their signaling mechanisms and effects?

Accepted Answer

The endocrine system releases hormones into the bloodstream, resulting in slower but longer-lasting effects compared to the nervous system.

Question 2

A patient presents with symptoms of weight loss, heat intolerance, and elevated heart rate. Laboratory tests reveal high levels of thyroid hormone. Which disorder is most likely present, and what is a common cause?

Accepted Answer

Hyperthyroidism; commonly caused by Graves' disease

Question 3

Which hormone is produced by the hypothalamus, stored in the posterior pituitary, and is responsible for water retention in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 4

A hydrophilic hormone is most likely to bind to which type of receptor?

Accepted Answer

A receptor embedded in the plasma membrane

Question 5

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

Accepted Answer

Low blood calcium stimulates PTH release, which increases blood calcium, then inhibits further PTH secretion.

Question 6

Which hormone is secreted by the adrenal cortex and is primarily responsible for regulating sodium and potassium ion concentrations in the body?

Accepted Answer

Aldosterone

Question 7

A patient with hyperaldosteronism is likely to exhibit which of the following symptoms?

Accepted Answer

Hypokalemia, hypernatremia, and hypertension

Question 8

Which of the following best explains the role of insulin in blood glucose regulation?

Accepted Answer

Insulin decreases blood glucose by promoting uptake of glucose into cells.

Question 9

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium concentration?

Accepted Answer

Parathyroid hormone (PTH)

Question 10

A 10-year-old child is diagnosed with gigantism. Which hormone is most likely being hypersecreted, and at what stage of development does this condition occur?

Accepted Answer

Growth hormone; before epiphyseal plate closure

Question 11

Which of the following is a correct sequence for the multi-tiered negative feedback control of thyroid hormone production?

Accepted Answer

TRH from hypothalamus → TSH from anterior pituitary → thyroid hormone from thyroid gland

Question 12

Which of the following best describes the effect of glucagon on blood glucose levels?

Accepted Answer

Glucagon increases blood glucose by stimulating glycogen breakdown and gluconeogenesis.

Question 13

A patient with a tumor in the adrenal medulla is likely to have elevated levels of which hormone, and what is a likely physiological effect?

Accepted Answer

Epinephrine; increased heart rate and blood pressure

Question 14

Which of the following hormones is NOT produced by the anterior pituitary gland?

Accepted Answer

Oxytocin

Question 15

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

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 16

A patient is experiencing low blood pressure, dehydration, and high blood potassium levels. Which hormone is most likely deficient?

Accepted Answer

Aldosterone

Question 17

Which of the following best describes the role of melatonin?

Accepted Answer

Regulates sleep-wake cycles in response to light and dark

Question 18

Which hormone is secreted in response to increased blood glucose and acts to lower blood glucose levels?

Accepted Answer

Insulin

Question 19

Which of the following is a function of parathyroid hormone (PTH)?

Accepted Answer

Stimulates osteoclast activity to increase blood calcium

Question 20

A patient with pituitary dwarfism is most likely to have which of the following?

Accepted Answer

Hyposecretion of growth hormone before epiphyseal plate closure

Study Guide: The Endocrine System (Anatomy & Physiology)

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