Question 1

Which of the following best describes the concept of homeostasis in the human body?

Accepted Answer

A dynamic process that maintains a relatively stable range of internal conditions despite external changes.

Question 2

In the homeostatic control system, what is the primary role of the receptor?

Accepted Answer

To monitor and detect changes in the variable being regulated.

Question 3

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

Accepted Answer

Amplification of uterine contractions during childbirth.

Question 4

A patient is experiencing hypotension due to decreased blood volume. Which homeostatic response is most likely to occur?

Accepted Answer

The kidneys will retain more fluid to increase blood volume.

Question 5

Which statement about mass balance in homeostasis is correct?

Accepted Answer

Mass balance is achieved when the amount of a substance taken in equals the amount lost.

Question 6

Which of the following elements is the major cation inside cells and is essential for nerve impulse transmission?

Accepted Answer

Potassium ($$K^+)$$

Question 7

What is the main function of enzymes in biological systems?

Accepted Answer

They lower the activation energy required to initiate chemical reactions.

Question 8

Which of the following best describes an anion?

Accepted Answer

An atom that has gained electrons and carries a negative charge.

Question 9

A solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-7}$$ M. What is its pH?

Accepted Answer

$$pH = 7$$

Question 10

Which property of water allows it to absorb and release heat with little temperature change, helping maintain body temperature?

Accepted Answer

High heat capacity

Question 11

Which of the following best explains why sodium ($$Na) $$and chloride ($$Cl) $$form a stable ionic compound?

Accepted Answer

Sodium loses an electron to become $$Na^+$$ and chloride gains an electron to become $$Cl^-$$, resulting in electrostatic attraction.

Question 12

Which of the following is a consequence of aging on homeostatic mechanisms?

Accepted Answer

Positive feedback mechanisms can overwhelm negative feedback, increasing risk of imbalance.

Question 13

Which of the following is true about valence electrons?

Accepted Answer

They determine how atoms interact and form chemical bonds.

Question 14

Which type of chemical reaction is most associated with anabolic processes in the body?

Accepted Answer

Synthesis reactions

Question 15

Which of the following best describes a buffer system in the blood?

Accepted Answer

It resists changes in pH by accepting or donating $$H^+$$ ions.

Question 16

Which of the following elements is a key component of proteins and nucleic acids, forming strong amide bonds?

Accepted Answer

Nitrogen ($$N)$$

Question 17

Which of the following is a property of water that makes it a universal solvent in biological systems?

Accepted Answer

Its polar nature allows it to form hydration shells around charged molecules.

Question 18

Which of the following best describes the role of the control center in a homeostatic system?

Accepted Answer

It determines the set point and processes input from the receptor.

Question 19

Which of the following is true regarding enzyme specificity?

Accepted Answer

Enzymes are hyper-specific and usually act on a single substrate.

Question 20

A patient has a blood pH of 7.2. Which of the following best describes their condition?

Accepted Answer

Acidosis

Homeostasis and Biochemistry Basics – Study Notes for Anatomy & Physiology

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