Boyle's Law applies which of the following conditions?
When pressure is constant
When volume is constant
When temperature is increasing
When temperature remains constant
The Correct Answer is D
A. When pressure is constant: Boyle’s Law describes the inverse relationship between pressure and volume of a gas, so it does not apply when pressure is held constant. Instead, changes in volume directly affect pressure under Boyle’s Law conditions.
B. When volume is constant: Boyle’s Law cannot apply when volume is constant because the law specifically relates changes in pressure to changes in volume. If the volume does not change, pressure and volume are no longer inversely related in the context of this law.
C. When temperature is increasing: Boyle’s Law assumes that temperature is constant. If temperature rises, the relationship between pressure and volume is influenced by Charles’s Law instead, which accounts for gas expansion with temperature changes.
D. When temperature remains constant: Boyle’s Law applies under isothermal conditions, meaning temperature remains constant. It states that the pressure of a gas is inversely proportional to its volume (P₁V₁ = P₂V₂), a principle critical in understanding ventilation and the mechanics of breathing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"E","dropdown-group-2":"B","dropdown-group-3":"G","dropdown-group-4":"C","dropdown-group-4":"D"}
Explanation
Correct answer:
- Space between the visceral and parietal pleura: Pleural cavity
- Secondary branches of the bronchi leading to lung lobes: Lobar bronchi
- Smaller airways with no cartilage in their walls: Bronchioles
- Smallest airways in the conducting zone: Terminal bronchioles
- Tertiary branches of the bronchi serving bronchopulmonary segments: Segmental bronchi
Rationale for correct choices:
• Pleural cavity: The pleural cavity is the potential space located between the visceral pleura (covering the lungs) and the parietal pleura (lining the thoracic wall). It contains a thin layer of lubricating pleural fluid that reduces friction during respiration. This space also maintains negative pressure to help keep the lungs expanded.
• Lobar bronchi: Lobar bronchi are the secondary branches that arise from the primary bronchi. Each lobar bronchus supplies one lobe of the lung—three on the right and two on the left. They conduct air deeper into the lung and further divide into segmental bronchi.
• Bronchioles: Bronchioles are smaller conducting airways that branch from the segmental bronchi. Unlike bronchi, they lack cartilage in their walls and instead contain smooth muscle, allowing them to constrict or dilate. This makes them important in conditions such as asthma.
• Terminal bronchioles: Terminal bronchioles are the smallest airways within the conducting zone. They represent the final purely conducting structures before the respiratory zone begins. Beyond them are respiratory bronchioles, which participate in gas exchange.
• Segmental bronchi: Segmental bronchi are the tertiary branches of the bronchial tree. Each supplies a bronchopulmonary segment, which is a functionally independent unit of lung tissue. These segments are clinically significant because they can be surgically removed without affecting adjacent segments.
Rationale for incorrect options
• Bronchopulmonary segments: Bronchopulmonary segments are anatomical subdivisions of the lungs supplied by segmental bronchi. They are not airway structures themselves but regions of lung tissue. Therefore, they do not match any of the structural descriptions provided.
• Primary bronchi: Primary bronchi are the first branches of the trachea and enter each lung. They divide into lobar bronchi but do not directly supply lobes or segments as described in the statements. Thus, they do not correspond to the listed characteristics.
• Alveoli: Alveoli are microscopic air sacs located in the respiratory zone where gas exchange occurs. They are not part of the conducting airway system and do not function as bronchi or bronchioles. None of the statements describe gas exchange structures.
Correct Answer is A
Explanation
A. Pleural cavity: The pleural cavity is the potential space between the parietal pleura (lining the thoracic wall) and the visceral pleura (covering the lungs). It contains a small amount of lubricating fluid that reduces friction during lung expansion and contraction, allowing smooth respiratory movements while maintaining negative pressure to facilitate lung inflation.
B. Bronchial space: The bronchial space refers to the lumen of the bronchi through which air passes. It is not a cavity between pleural layers and does not play a role in pleural fluid dynamics or lung expansion.
C. Alveolar cavity: Alveolar cavities are microscopic air spaces within the lungs where gas exchange occurs. They are internal to the lung tissue and do not exist between the pleural layers.
D. Thoracic cavity: The thoracic cavity is the large compartment of the chest housing the lungs, heart, and major vessels. While it contains the pleural cavities, it is not specifically the space between the parietal and visceral pleurae.
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