Question 1

Which of the following best explains why your weight changes slightly when you move from the first floor to the tenth floor of a building, but your mass remains constant?

Accepted Answer

Weight depends on gravity, which changes slightly with elevation, while mass is independent of gravity.

Question 2

A patient is experiencing muscle weakness and irregular heartbeats. Blood tests reveal low potassium levels. Which of the following best explains why potassium is critical for normal body function?

Accepted Answer

Potassium is necessary for muscle contraction and electrical signaling in nerves.

Question 3

Which of the following reactions is both catabolic and exergonic?

Accepted Answer

The breakdown of glycogen into glucose, releasing energy.

Question 4

Which equation correctly represents a synthesis (anabolic) reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 5

A person is dehydrated after running a marathon. Which property of water is most directly responsible for the body's ability to regulate temperature during exercise?

Accepted Answer

High heat of vaporization, which allows sweat to remove excess heat as it evaporates.

Question 6

Which of the following best describes the relationship between hydrogen ion concentration and pH?

Accepted Answer

As hydrogen ion concentration increases, pH decreases.

Question 7

Which of the following is an example of an equilibrium reaction in the human body?

Accepted Answer

A reaction that can proceed in either direction to maintain homeostasis, such as $$CO_2 + H_2O$$ \leftrightarrow H_2CO_3$$

Question 8

Which property of water allows it to distribute heat evenly throughout the body, preventing localized overheating?

Accepted Answer

High heat capacity

Question 9

A solution has a pH of 6.3. Which of the following statements is correct?

Accepted Answer

The solution is acidic and has a higher hydrogen ion concentration than pure water.

Question 10

Which of the following best explains why water is an excellent solvent for transporting nutrients in the body?

Accepted Answer

Water dissolves many substances without chemically altering them, allowing for efficient transport.

Question 11

Which of the following best describes the role of calcium phosphate in the human body?

Accepted Answer

It is the most abundant salt, providing strength to bones and teeth.

Question 12

A patient with heartburn is advised to take an antacid. Which of the following best explains how antacids relieve heartburn?

Accepted Answer

Antacids are basic substances that absorb excess hydrogen ions, raising the pH toward neutral.

Question 13

Which of the following is an example of hydrolysis in the human body?

Accepted Answer

Breaking down a starch molecule into glucose units using water during digestion.

Question 14

Which of the following best describes the difference between organic and inorganic compounds?

Accepted Answer

Organic compounds contain carbon, while inorganic compounds do not.

Question 15

Which of the following best describes the function of ATP in cells?

Accepted Answer

ATP stores chemical energy in its bonds and releases energy when broken apart.

Question 16

Which of the following is a correct statement about cations and anions?

Accepted Answer

Cations are positively charged, while anions are negatively charged.

Question 17

Which of the following best illustrates the concept of potential energy in the human body?

Accepted Answer

A person sitting quietly in class, ready to stand up at any moment.

Question 18

Which of the following is a trace element that is essential for muscle contraction and nerve function?

Accepted Answer

Sodium

Question 19

Which of the following best describes dehydration synthesis?

Accepted Answer

A reaction that builds larger molecules by removing water.

Question 20

Which of the following is NOT a property of water that is important for human physiology?

Accepted Answer

Water has a low heat capacity, so it heats up quickly.

Chemistry of the Human Body: Chapter 2A Study Guide

Study Guide - Practice Questions

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