Q: Which of the following equations best represents the negative feedback mechanism regulating hormone levels in the blood?

$$\text{Hormone Release} = k \times (\text{Set Point} - \text{Current Level})$$

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 chemical messengers (hormones) for slower, longer-lasting control, 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 under-secreted, and what is its normal effect?

Accepted Answer

Calcitonin; it normally decreases blood calcium by promoting calcium deposition in bone.

Question 3

Which of the following is a correct sequence for the direct gene activation mechanism of steroid hormones?

Accepted Answer

Steroid hormone diffuses through plasma membrane, enters nucleus, binds to nuclear receptor, hormone-receptor complex binds DNA, activates transcription of mRNA.

Question 4

Which of the following hormones is released in response to neural stimuli, specifically sympathetic nervous system activation?

Accepted Answer

Epinephrine

Question 5

A patient with diabetes mellitus has high blood glucose levels. Which pancreatic hormone is deficient, and what is its normal effect?

Accepted Answer

Insulin; it normally decreases blood glucose by increasing cellular uptake and metabolism of glucose.

Question 6

Which of the following is NOT a typical effect of hormone binding to its target cell?

Accepted Answer

Direct synthesis of ATP from glucose without enzyme involvement

Question 7

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

Accepted Answer

It produces hormones that regulate the activity of many other endocrine glands.

Question 8

Which hormone is released by the posterior pituitary and is known as vasopressin due to its effect on blood pressure?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

A patient is experiencing symptoms of dehydration and low blood pressure after consuming large amounts of alcohol. Which hormone is most likely inhibited, and what is its normal function?

Accepted Answer

Antidiuretic hormone (ADH); promotes water reabsorption by the kidneys, reducing urine volume and increasing blood pressure.

Question 10

Which of the following is a correct description of the second-messenger system used by protein and peptide hormones?

Accepted Answer

Hormone binds to plasma membrane receptor, activates an enzyme, produces a second messenger (such as cAMP), which triggers intracellular changes.

Question 11

Which of the following equations best represents the negative feedback mechanism regulating hormone levels in the blood?

Accepted Answer

$$	ext{Hormone Release} = k 	imes (	ext{Set Point} - 	ext{Current Level})$$

Question 12

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

Accepted Answer

Changing blood calcium levels stimulating parathyroid hormone release.

Question 13

Which hormone is produced by the pineal gland and is believed to regulate the sleep/wake cycle?

Accepted Answer

Melatonin

Question 14

Which of the following is a tropic hormone produced by the anterior pituitary that stimulates the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 15

A patient has low sodium and high potassium levels in their blood. Which hormone is most likely deficient, and what is its primary target organ?

Accepted Answer

Aldosterone; kidney

Question 16

Which hormone is released in response to increased blood levels of ACTH and helps resist long-term stress by increasing blood glucose levels?

Accepted Answer

Cortisol

Question 17

Which of the following best describes the antagonistic relationship between insulin and glucagon?

Accepted Answer

Insulin decreases blood glucose, while glucagon increases it.

Question 18

Which of the following glands is considered a mixed gland, having both endocrine and exocrine functions?

Accepted Answer

Pancreas

Question 19

Which hormone is responsible for stimulating follicle development in ovaries and sperm development in testes?

Accepted Answer

Follicle-stimulating hormone (FSH)

Chapter 9: The Endocrine System – Essentials of Human Anatomy & Physiology

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