Question 1

Which of the following best describes the primary difference between the endocrine and nervous systems in terms of control and communication?

Accepted Answer

The endocrine system uses hormones for slower, long-term regulation, while the nervous system uses electrical impulses for rapid, short-term control.

Question 2

A patient presents with abnormally high blood calcium levels. Which hormone is most likely being under-secreted, and from which gland?

Accepted Answer

Calcitonin from the thyroid gland

Question 3

Which of the following is an example of a humoral stimulus for hormone release?

Accepted Answer

The parathyroid glands releasing PTH in response to low blood calcium levels

Question 4

A tumor destroys the anterior pituitary gland. Which of the following hormones would most likely decrease in the blood as a direct result?

Accepted Answer

Growth hormone (GH)

Question 5

Which hormone is released by the pancreas in response to high blood glucose levels, and what is its primary effect?

Accepted Answer

Insulin; decreases blood glucose by increasing cellular uptake of glucose

Question 6

Which of the following best explains why the pituitary gland is often called the 'master endocrine gland'?

Accepted Answer

It directly controls the release of hormones from other endocrine glands.

Question 7

A patient with damage to the adrenal cortex would most likely have difficulty with which of the following physiological processes?

Accepted Answer

Regulating blood sodium and potassium levels

Question 8

Which hormone is responsible for stimulating the development of secondary male sex characteristics and sperm production?

Accepted Answer

Testosterone

Question 9

A child is diagnosed with pituitary dwarfism. Which of the following best describes the underlying cause?

Accepted Answer

Hyposecretion of growth hormone during childhood

Question 10

Which of the following best describes the role of the pineal gland?

Accepted Answer

Secretes melatonin to help regulate sleep/wake cycles

Question 11

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

Accepted Answer

Antidiuretic hormone (ADH)

Question 12

A patient has low blood sodium and high blood potassium levels. Which hormone is most likely deficient?

Accepted Answer

Aldosterone

Question 13

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

Accepted Answer

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

Question 14

Which hormone is produced by the thyroid gland and acts to decrease blood calcium levels?

Accepted Answer

Calcitonin

Question 15

Which of the following best describes the effect of parathyroid hormone (PTH) on bone?

Accepted Answer

Stimulates osteoclasts to release calcium into the blood

Question 16

A patient is experiencing symptoms of chronic stress, including elevated blood glucose and suppressed immune function. Which hormone is most likely elevated?

Accepted Answer

Cortisol

Question 17

Which hormone is secreted by the adrenal medulla in response to neural stimuli and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 18

Which hormone is essential for the maturation of T lymphocytes and is produced by a gland that is largest in infants and children?

Accepted Answer

Thymosin

Question 19

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

Accepted Answer

The hypothalamus produces releasing and inhibiting hormones that regulate the anterior pituitary via portal circulation.

Question 20

A patient is unable to maintain pregnancy due to insufficient hormone production by the placenta. Which hormone is most likely deficient?

Accepted Answer

Human chorionic gonadotropin (hCG)

The Endocrine System: Structure, Function, and Hormonal Regulation

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