Which of the following best describes the diversity of the human microbiome?
It is found only in the gut.
It remains constant throughout a person's life.
It includes bacteria, viruses, fungi, and other microorganisms.
It consists of a single type of bacteria.
The Correct Answer is C
A. It is found only in the gut: While the gut harbors a large portion of the microbiome, microorganisms also inhabit the skin, oral cavity, respiratory tract, and urogenital tract.
B. It remains constant throughout a person's life: The microbiome is dynamic and can change due to diet, environment, medications, age, and illness, showing considerable variability over time.
C. It includes bacteria, viruses, fungi, and other microorganisms: The human microbiome is composed of a diverse array of microorganisms, including bacteria, viruses, fungi, and protozoa, all of which interact with the host and each other to influence health.
D. It consists of a single type of bacteria: The microbiome is highly diverse; a single bacterial species cannot represent its complexity or functional roles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Lymph vessels: Lymph vessels transport interstitial fluid and do not play a direct role in regulating blood pressure or circulatory resistance during shock.
B. Arterioles: Arterioles are small resistance vessels that regulate blood flow and systemic vascular resistance through constriction or dilation, making them critical in maintaining perfusion during shock.
C. Capillaries: Capillaries are the site of nutrient and gas exchange, but they do not actively control vessel tone or systemic blood pressure.
D. Large veins: Large veins serve as capacitance vessels and blood reservoirs; their tone affects venous return, but arteriolar constriction is more directly responsible for perfusion changes in shock.
Correct Answer is B
Explanation
. Producing mucus for the respiratory tract: Mucus is produced by goblet cells in the airway lining to trap dust, microbes, and other particles, not by alveoli.
B. Gas exchange between oxygen and carbon dioxide: Alveoli are tiny, thin-walled sacs at the end of bronchioles. Their large surface area and close association with pulmonary capillaries allow efficient diffusion of oxygen into the blood and carbon dioxide out of the blood.
C. Filtering dust particles from inhaled air: Filtration occurs primarily in the nasal passages, cilia, and mucus of the upper and lower airways, not within the alveoli.
D. Maintaining the shape of the lungs: Lung shape is maintained by the thoracic cavity, connective tissue, and surfactant, while alveoli function mainly in gas exchange.
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