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

If the normal fasting blood glucose range is 70–99 mg/dL, what is the physiological term for the value around which blood glucose fluctuates?

Accepted Answer

Set point

Question 6

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

Accepted Answer

Nervous tissue

Question 7

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

Accepted Answer

Endocrine system

Question 8

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

Accepted Answer

It establishes the set point and receives input from the receptor

Question 9

A patient’s body temperature rises above the normal range. Which component of the feedback loop is responsible for initiating a response to lower the temperature?

Accepted Answer

Effector

Question 10

Which of the following equations best represents the relationship between atoms and molecules at the chemical level?

Accepted Answer

$\mathrm{Atoms} \rightarrow \mathrm{Molecules}$

Question 11

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

Accepted Answer

Cardiovascular system

Question 12

Which of the following is NOT a function of epithelial tissue?

Accepted Answer

Transmission of electrical impulses

Question 13

A person eats a large meal, causing blood glucose to rise. Which hormone is released to restore homeostasis, and what type of feedback is this?

Accepted Answer

Insulin; negative feedback

Question 14

Which of the following best illustrates the concept of homeostasis using a real-life example?

Accepted Answer

Sweating to cool the body when overheated

Question 15

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

Accepted Answer

Organs are made of two or more tissues

Question 16

If $x$ represents the value of a physiological variable and $x_{set}$ is the set point, which equation describes the deviation from homeostasis?

Accepted Answer

$|x - x_{set}|$

Question 17

Which of the following is a correct sequence for the components of a feedback loop?

Accepted Answer

Receptor → Control center → Effector

Question 18

Which of the following statements about physiological variables is TRUE?

Accepted Answer

Physiological variables fluctuate around a set point within a normal range

Question 19

Which of the following is an example of a system level of organization?

Accepted Answer

Urinary system

Question 20

A patient’s blood pressure is measured to be above the normal range. Which of the following best describes the homeostatic response?

Accepted Answer

The control center signals the effector to lower blood pressure

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