Question 1

Which of the following correctly lists the levels of structural organization in the human body from simplest to most complex?

Accepted Answer

Chemical, cellular, tissue, organ, system, organismal

Question 2

Homeostasis is best defined as:

Accepted Answer

A balance in the body's internal environment maintained by coordinated body structures

Question 3

Which of the following is an example of a negative feedback loop in human physiology?

Accepted Answer

Regulation of blood glucose levels after a meal

Question 4

A receptor in a feedback loop functions to:

Accepted Answer

Monitor the value of a variable by detecting a stimulus

Question 5

Which tissue type is responsible for transmitting electrical impulses throughout the body?

Accepted Answer

Nervous tissue

Question 6

If a person's fasting blood glucose is measured at 130 mg/dL (normal range: 70–99 mg/dL), which component of the feedback loop is most likely to be activated first?

Accepted Answer

Receptor

Question 7

Which organ system is primarily responsible for transporting nutrients, gases, and wastes throughout the body?

Accepted Answer

Cardiovascular system

Question 8

Which of the following best describes the relationship between organs and tissues?

Accepted Answer

Organs are made up of two or more tissues

Question 9

A patient has a body temperature of 39°C (normal: 36.5–37.5°C). Which equation best represents the concept of homeostasis in this scenario?

Accepted Answer

$$Set\ Point - Actual\ Value = Error$$

Question 10

Which of the following is NOT a physiological variable regulated by homeostasis?

Accepted Answer

Hair color

Question 11

During an overnight fast, which organ system is most involved in maintaining blood glucose levels?

Accepted Answer

Endocrine system

Question 12

Which of the following best illustrates a positive feedback loop?

Accepted Answer

Release of oxytocin during labor contractions

Question 13

Which equation represents the normal range of a physiological variable?

Accepted Answer

$$Set\ Point \pm Range$$

Question 14

Which of the following is the correct order of events in a feedback loop?

Accepted Answer

Receptor → Control center → Effector

Question 15

Which tissue type lines the surfaces and cavities of organs and structures throughout the body?

Accepted Answer

Epithelial tissue

Question 16

A person eats a large meal, causing blood glucose to rise. Which organ acts as the control center to restore homeostasis?

Accepted Answer

Pancreas

Question 17

Which of the following is a function of the urinary system?

Accepted Answer

Regulating blood pressure and removing waste

Question 18

Which of the following best describes the role of the effector in a feedback loop?

Accepted Answer

Generates a response to change the value of the variable

Question 19

Which organ system is responsible for breaking down food and absorbing nutrients?

Accepted Answer

Digestive system

Question 20

A patient is experiencing high blood pressure. Which feedback mechanism is most likely to be activated to restore normal levels?

Accepted Answer

Negative feedback

Introduction to the Human Organism: Levels of Organization and Homeostasis

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