A charge nurse is reinforcing teaching to a group of nurses about diffusion. Which of the following statements should the charge nurse include in their teaching about diffusion?
"Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration."
"Diffusion is the movement of particles between areas of equal concentrations."
"Diffusion is the movement of water from an area of higher concentration of water to an area of lower concentration of water."
"Diffusion is the movement of particles from an area of lower concentration of particles to an area of higher concentration of particles."
The Correct Answer is A
A. "Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.": This statement accurately describes diffusion. Molecules move down their concentration gradient from areas of higher concentration to areas of lower concentration until equilibrium is reached.
B. "Diffusion is the movement of particles between areas of equal concentrations.": Diffusion does not occur between areas of equal concentration as there is no concentration gradient to drive the movement.
C. "Diffusion is the movement of water from an area of higher concentration of water to an area of lower concentration of water.": This describes osmosis, not diffusion. Osmosis specifically refers to the movement of water across a semipermeable membrane.
D. "Diffusion is the movement of particles from an area of lower concentration of particles to an area of higher concentration of particles.": This is incorrect as diffusion occurs from higher to lower concentration, not the reverse.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Hyperventilate the client with 100% oxygen before suctioning the airway: Hyperventilation before suctioning is a method to prevent hypoxia, not to thin secretions. It does not affect the viscosity of secretions.
B. Provide humidified oxygen: Humidified oxygen helps to moisten the airways, which can thin secretions, making them easier to clear. This is an appropriate intervention for managing tenacious secretions in a client with a tracheostomy.
C. Perform chest physiotherapy prior to suctioning: Chest physiotherapy helps mobilize secretions but does not thin them. While useful in clearing airways, it is not a direct method for thinning secretions.
D. Prelubricate the suction catheter tip with sterile saline when suctioning the airway: Prelubricating the suction catheter is done to reduce friction and trauma during suctioning but does not impact the thickness of the secretions.
Correct Answer is A
Explanation
A. Absence of breath sounds over the affected area is a hallmark sign of a pneumothorax. This occurs because air in the pleural space prevents lung expansion, leading to a lack of air movement and, consequently, no breath sounds. Monitoring for this symptom is critical in identifying a pneumothorax.
B. Coarse crackles are typically associated with fluid in the lungs, such as in cases of pulmonary edema or pneumonia. These sounds are not indicative of a pneumothorax, where air rather than fluid accumulates in the pleural space.
C. Inspiratory stridor is a high-pitched sound often associated with upper airway obstruction, such as in cases of croup or foreign body aspiration. It is not a common manifestation of a pneumothorax, which involves the pleural space rather than the upper airway.
D. Expiratory wheeze is typically associated with conditions that involve narrowing of the airways, such as asthma or chronic obstructive pulmonary disease (COPD). It is not a characteristic finding in pneumothorax, where the issue is lung collapse rather than airway constriction.
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