Question 1

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

Accepted Answer

The process by which the body maintains a relatively stable range of internal conditions despite continuous environmental changes.

Question 2

A patient is exposed to cold weather, causing their body temperature to drop below the normal set point. Which homeostatic mechanism will most likely be activated?

Accepted Answer

Negative feedback, which will trigger responses to increase body temperature back to the set point.

Question 3

Which of the following is NOT a requirement for an organism to be considered alive?

Accepted Answer

Ability to photosynthesize.

Question 4

Which of the following is the most abundant chemical in the human body and creates a watery environment for chemical reactions?

Accepted Answer

Water

Question 5

A person touches a hot stove and immediately pulls their hand away. Which physiological property is being demonstrated?

Accepted Answer

Responsive and excitable

Question 6

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes decrease the activation energy required and facilitate reactions in a single direction.

Question 7

Which of the following is a correct statement about negative feedback in homeostasis?

Accepted Answer

Negative feedback causes variable changes in the opposite direction to restore balance.

Question 8

Which of the following ions is positively charged and plays a major role in muscle contraction and nerve impulse conduction?

Accepted Answer

Calcium (Ca2+)

Question 9

A solution has a pH of 8. Which of the following statements is true?

Accepted Answer

The solution is alkaline (basic) and has a low concentration of H+ ions.

Question 10

Which of the following best explains why water is an effective solvent in the human body?

Accepted Answer

Water has polar solvent properties, dissolving ionic substances and forming hydration shells around charged molecules.

Question 11

Which of the following is a correct description of a compound?

Accepted Answer

A compound consists of two or more different kinds of atoms bonded together.

Question 12

Which of the following is a product of protein breakdown and is excreted in urine?

Accepted Answer

Urea

Question 13

Which of the following best describes the law of mass balance in homeostasis?

Accepted Answer

The total amount of a substance in the body must equal the amount it loses over time.

Question 14

Which of the following is a correct statement about valence electrons?

Accepted Answer

Valence electrons are the outermost electrons and participate in chemical reactions.

Question 15

Which of the following is a correct formula for the calculation of pH?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 16

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers help resist abrupt and large swings in pH, maintaining homeostasis.

Question 17

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

Accepted Answer

Uterine contractions during childbirth, which increase in intensity as more oxytocin is released.

Question 18

Which of the following statements about chemical reactions is correct?

Accepted Answer

Chemical reactions involve the formation, rearrangement, or breaking of chemical bonds.

Question 19

Which of the following is a correct description of the role of ATP in metabolism?

Accepted Answer

ATP is the fundamental unit of biological energy, used to power cellular processes.

Question 20

Which of the following statements about cell specialization is correct?

Accepted Answer

Cells are specialized to perform different functions, increasing efficiency and survival.

Anatomy & Physiology: Homeostasis, Biochemistry, and Cellular Basics

Study Guide - Practice Questions

Study Guide - Flashcards