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 uses hormones that travel through the bloodstream and has longer-lasting effects than the nervous system.

Question 2

A patient presents with low blood calcium levels. Which hormone is most likely to be released in response, and what is one of its primary actions?

Accepted Answer

Parathyroid hormone (PTH); stimulates osteoclasts to break down bone and release calcium.

Question 3

Which of the following is NOT a pure endocrine organ?

Accepted Answer

Pancreas

Question 4

A person with Grave’s disease is likely to exhibit which of the following symptoms?

Accepted Answer

High metabolic rate, sweating, bulging eyes, and weight loss

Question 5

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

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

Which of the following best explains why a person with Type 1 diabetes mellitus experiences excessive thirst and urination?

Accepted Answer

High blood glucose causes the kidneys to excrete more water to dilute the sugar.

Question 7

Which hormone is primarily responsible for stimulating milk production in the mammary glands?

Accepted Answer

Prolactin

Question 8

A patient has a tumor in the zona glomerulosa of the adrenal cortex. Which hormone is most likely to be overproduced?

Accepted Answer

Aldosterone

Question 9

Which of the following scenarios is an example of hormonal stimuli?

Accepted Answer

Thyroid stimulating hormone (TSH) triggers the thyroid to release thyroxine.

Question 10

Which hormone is produced by alpha cells in the pancreas and what is its main effect?

Accepted Answer

Glucagon; raises blood glucose by stimulating glycogen breakdown in the liver.

Question 11

Which of the following best describes the role of the hypothalamus in the endocrine system?

Accepted Answer

It acts as a neuroendocrine organ, producing hormones that regulate the pituitary gland.

Question 12

A patient with a deficiency in Growth Hormone (GH) during childhood is most likely to develop which condition?

Accepted Answer

Dwarfism

Question 13

Which hormone is released in response to concentrated blood and acts on the kidneys to conserve water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 14

Which of the following is a function of cortisol released from the adrenal cortex?

Accepted Answer

Helps resist stress by maintaining blood glucose levels

Question 15

Which hormone is responsible for stimulating gamete production in both males and females?

Accepted Answer

Follicle stimulating hormone (FSH)

Question 16

Which of the following best explains why a person with hypothyroidism might experience weight gain and lethargy?

Accepted Answer

Decreased thyroid hormone reduces basal metabolic rate, leading to less energy use and more fat storage.

Question 17

Which hormone is produced by the pineal gland and what is its main function?

Accepted Answer

Melatonin; regulates sleep/wake cycles

Question 18

A patient is found to have high levels of androgens from the adrenal cortex. Which layer is most likely overactive?

Accepted Answer

Zona reticularis

Question 19

Which hormone is released from the anterior pituitary and stimulates the adrenal cortex to release glucocorticoids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 20

Which of the following is a correct sequence for hormonal regulation involving the hypothalamus, anterior pituitary, and thyroid gland?

Accepted Answer

TRH from hypothalamus → TSH from anterior pituitary → Thyroid hormones from thyroid gland

The Endocrine System: Structure, Function, and Hormonal Regulation

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