The nurse is caring for a client with cystic fibrosis who is experiencing thick mucus secretions. Which nursing interventions are appropriate? Select one that doesn't apply.

Correct Answer: C

Rationale: Increased fluids (A), aerosol therapy (B), and percussion (D) help mobilize thick mucus in cystic fibrosis, improving airway clearance.

Correct Answer: A

Rationale: Oxygen is stored in the atmosphere (air), hydrosphere (water), biosphere (organisms), and lithosphere (crust), making all listed reservoirs correct.

Correct Answer: A

Rationale: The cylinder must always be checked before use to ensure that enough oxygen is available for the patient. It is unsafe to use a cylinder that reads 500 psi or less because not enough oxygen remains for a patient transfer. A cylinder that is not secured properly may result in injury to the patient. Oxygen flow is discontinued by turning the valve clockwise until it is tight.

Correct Answer: C

Rationale: Portable suction units for adults typically use 10-15 mmHg to safely remove secretions while minimizing mucosal trauma.

Correct Answer: B

Rationale: Sucrase breaks sucrose into glucose and fructose, its constituent monosaccharides.