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.
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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 D
Explanation
A. Hypothermia: Pneumonia typically presents with fever rather than hypothermia. Fever is a common response to infection and inflammation.
B. Bradycardia: Pneumonia usually causes tachycardia rather than bradycardia. Tachycardia is a compensatory response to improve oxygen delivery to tissues.
C. Pulse deficit: A pulse deficit is not a common finding in pneumonia. It is more associated with conditions like atrial fibrillation.
D. Tachypnea: Tachypnea, or rapid breathing, is a common sign of pneumonia. It reflects the body’s attempt to improve oxygenation and compensate for impaired gas exchange.
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