Question 1

Which of the following best describes homeostasis as defined by Walter Cannon?

Accepted Answer

A process that maintains the body's internal environment within certain physiological limits.

Question 2

Which of the following is considered a variable in the context of homeostasis?

Accepted Answer

Body temperature

Question 3

Which fluid is found inside cells and is also known as intracellular fluid (ICF)?

Accepted Answer

Cytosol

Question 4

A patient is experiencing high blood glucose levels. Which of the following correctly describes the negative feedback loop that would restore homeostasis?

Accepted Answer

Receptors in the pancreas detect high glucose, the pancreas (control center) releases insulin (effector), and blood glucose decreases.

Question 5

Which of the following is an example of a positive feedback loop in the human body?

Accepted Answer

Blood clotting

Question 6

During thermoregulation, which of the following is the correct sequence of events when body temperature increases?

Accepted Answer

Stimulus (increased temp) → Receptors (skin/brain) → Control center (brain) → Effectors (sweat glands, vasodilation) → Response (decreased temp)

Question 7

Which of the following best differentiates a negative feedback loop from a positive feedback loop?

Accepted Answer

A negative feedback loop reverses the original stimulus, while a positive feedback loop intensifies it.

Question 8

Which of the following is NOT a component of the homeostatic feedback loop?

Accepted Answer

Mitochondria

Question 9

A person is exposed to cold temperatures, causing a decrease in body temperature. Which of the following responses is part of the negative feedback loop to restore homeostasis?

Accepted Answer

Constriction of blood vessels and shivering to increase body temperature

Question 10

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

Accepted Answer

They bring about a change in the controlled condition to restore homeostasis.

Question 11

Which of the following fluids is considered extracellular fluid (ECF)?

Accepted Answer

Plasma

Question 12

In the context of homeostasis, what is the primary function of the control center?

Accepted Answer

To receive input from receptors and send output to effectors

Question 13

Which of the following scenarios best illustrates a negative feedback loop?

Accepted Answer

An increase in blood pressure triggers responses that lower blood pressure back to normal.

Question 14

Which of the following statements about positive feedback loops is correct?

Accepted Answer

They intensify the original stimulus and are used to complete specific tasks such as childbirth.

Question 15

Which of the following best describes the relationship between interstitial fluid and extracellular fluid (ECF)?

Accepted Answer

Interstitial fluid is a type of extracellular fluid found between tissue cells.

Question 16

A patient has a condition where their blood pressure remains elevated despite normal feedback mechanisms. Which component of the homeostatic feedback loop is most likely malfunctioning?

Accepted Answer

The effectors, such as the heart and blood vessels, are not responding appropriately to signals from the control center.

Question 17

Which of the following best represents the correct order of levels of organization in the human body from simplest to most complex?

Accepted Answer

Atoms → Molecules → Organelles → Cells → Tissues → Organs → Organ systems → Organism

Homeostasis and Levels of Organization: Foundations of Anatomy & Physiology

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