What happens to the total pressure of a gas mixture when the partial pressures of all gases are added together?
It doubles
It remains unchanged
It decreases
It equals the sum of the partial pressures
The Correct Answer is D
A. It doubles: The total pressure of a gas mixture does not automatically double when combining gases. Doubling would only occur if each gas contributed an identical pressure and quantity, which is not generally the case in a mixture of different gases.
B. It remains unchanged: The total pressure of a gas mixture is directly dependent on the sum of the pressures exerted by individual gases. It cannot remain unchanged if partial pressures of the component gases vary or are combined.
C. It decreases: Total pressure decreases only if gas molecules are removed or the volume is increased. Simply adding partial pressures does not reduce total pressure; it accumulates the contributions of all gases present.
D. It equals the sum of the partial pressures: According to Dalton’s Law of Partial Pressures, the total pressure of a gas mixture is equal to the sum of the individual partial pressures of each gas in the mixture. Each gas contributes independently to the total pressure based on its mole fraction and temperature.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The bicarbonate buffering system in the blood helps maintain pH homeostasis by converting carbon dioxide into bicarbonate. When carbon dioxide (CO₂) dissolves in water, it forms carbonic acid (H₂CO₃), which can dissociate into hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻). This reversible reaction, catalyzed by the enzyme carbonic anhydrase, allows the blood to neutralize excess acids or bases. For example, when the blood becomes too acidic, bicarbonate binds H⁺ to form carbonic acid, which can be converted back into CO₂ and exhaled via the lungs. This system is the primary extracellular buffer, critical for stabilizing pH during metabolic and respiratory changes.
Correct Answer is {"dropdown-group-1":"A","dropdown-group-2":"B","dropdown-group-3":"C"}
Explanation
I: Lobar bronchus- The lobar (secondary) bronchi branch from the primary bronchi, with one serving each lobe of the lung—three on the right and two on the left. They are supported by cartilage and lined with ciliated epithelium, distributing inhaled air to specific lobes and aiding in filtration and mucus clearance.
K: Left oblique fissure- The left oblique fissure is a deep groove that separates the left lung’s superior and inferior lobes. It provides structural division for the lung lobes, helping compartmentalize airflow and facilitating independent expansion and contraction of each lobe during respiration.
B: Horizontal fissure- The horizontal (minor) fissure is found only in the right lung and separates the superior and middle lobes. Like the oblique fissure, it helps define lung lobes anatomically, directing airflow appropriately and allowing for efficient ventilation and surgical orientation.
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