Practice Questions: Body Organization, Homeostasis, and Fluid Compartments

Which of the following best defines homeostasis?

The maintenance of a relatively stable internal environment despite external fluctuations.

During a vigorous physical therapy session, a patient's body temperature rises, and he begins sweating profusely. This sweating response is an example of:

Negative feedback to maintain thermal homeostasis

Which group correctly lists the four most abundant atoms in the human body?

Carbon, Hydrogen, Oxygen, Nitrogen

What is considered the structural and functional unit of life?

The cell

Which organelle is often called the "powerhouse of the cell" because it generates ATP through cellular respiration?

Mitochondria

Which of the following correctly describes the distribution of fluid compartments in the human body?

About two-thirds of total body water is intracellular fluid, and one-third is extracellular fluid.

Which statement best describes the differences in protein concentration between plasma, interstitial fluid (ISF), and intracellular fluid (ICF)?

Plasma contains more protein than ISF, and ICF contains the highest overall protein concentration.

Which statement about total body water (TBW) is most accurate?

TBW decreases with age, in part due to increased fat and decreased muscle mass.

A physical therapist is treating a hospitalized patient who develops pneumonia after prolonged bed rest. Which organ system's direct communication with the external environment most likely served as the portal of entry for the infection?

Respiratory system

Which of the following correctly compares the ionic composition of intracellular fluid (ICF) and interstitial fluid (ISF)?

ICF has high potassium; ISF has high sodium and chloride.

A patient undergoing chemotherapy presents with severe diarrhea and abdominal pain. Stool cultures confirm Clostridioides difficile infection, acquired after broad-spectrum antibiotic use. Through which organ system did the pathogen most likely enter and establish infection?

Digestive system

An elderly patient with limited mobility develops a urinary tract infection (UTI) after prolonged use of an indwelling catheter. This is an example of infection facilitated by which organ system's direct communication with the external environment?

Urinary system

A physical therapist notes redness, swelling, and drainage around a patient's surgical incision site following a knee replacement. The infection most likely developed due to disruption of which organ system's protective barrier that communicates with the external environment?

Integumentary system

Which of the following lists the general requirements for human life?

Oxygen, nutrients, narrow temperature range, narrow atmospheric pressure range

Which of the following best represents the general characteristics of life?

Organization, metabolism, responsiveness, growth, development, reproduction

Which of the following lists the four main classes of organic macromolecules essential for life?

Nucleic acids, lipids, proteins, carbohydrates

Which of the following lists the four primary types of tissue in the human body?

Nervous, epithelial, connective, muscle