Which statement regarding hyperbaric oxygen therapy is INCORRECT?

Correct Answer: A

Rationale: no consistent evidence shows males eliminate carboxyhemoglobin (COHb) faster than females elimination depends on Oâ‚‚ partial pressure and ventilation. Choice B is true; ambient air compresses, but Oâ‚‚ is 100%. ' dissolved Oâ‚‚ rises (e.g., 6 mL/100 mL at 3 atm). Choice D is accurate; therapy uses 2-3 atm. Choice E (toxicity) is plausible. Hyperbaric Oâ‚‚ accelerates COHb clearance equally by POâ‚‚, not sex, making A the false claim.

Correct Answer: A

Rationale: physiological dead space (anatomic + alveolar) equals anatomical dead space (≈150 mL) in healthy lungs at rest alveolar dead space is negligible. Choice B is true; base ventilates more (gravity). Choice C is correct (7 mL/kg, ≈500 mL for 70 kg). Choice D is accurate; resistance drops with volume (airway stretch). Choice E (20x increase) is true. Normal Vₓ/Vₜ (0.3) matches anatomic dead space, making A's ‘larger' claim false.

Correct Answer: B

Rationale: Cough suppressants are medications that reduce the cough reflex, which can be helpful for sleep but may hinder airway clearance during the day when the body needs to expel mucus. For an adolescent with flu symptoms, promoting airway clearance is critical to prevent mucus buildup, which could lead to complications like pneumonia. Using cough suppressants at night allows the client to rest while still enabling productive coughing during the day to clear the airways. Morning, evening, or afternoon use could suppress coughing when it's most needed to expel mucus, especially since flu often involves increased respiratory secretions. The nurse's focus is on balancing symptom relief with the body's natural defense mechanisms, and nighttime use aligns with this goal by prioritizing rest without fully inhibiting airway clearance throughout the day. This approach supports recovery by ensuring mucus is cleared effectively while minimizing discomfort during sleep.

Correct Answer: A

Rationale: The body's natural defenses against influenza include viscous mucus secretions in the respiratory tract that trap viral particles, preventing deeper penetration, and local immunologic defenses like antibodies and inflammatory responses that neutralize the virus at entry points. This inflammation, triggered by immune cells, fights infection but causes symptoms like swelling or fever. Vasodilation occurs, but lowering body temperature isn't a defense fever actually helps combat viruses. Antihistamines aren't naturally released; they're medications, and catecholamines boost alertness, not immunity. Coughing clears mucus, but antidiuretic hormone inhibition isn't a flu defense it relates to fluid balance. The nurse explains mucus and local immunity as key barriers, educating the client on how the body resists influenza naturally before adaptive immunity fully activates, emphasizing their role in limiting viral spread and aiding recovery.

Correct Answer: A

Rationale: A runny nose during flu stems from cells lining the respiratory passages dying due to viral attack, releasing fluid and sparking inflammation that boosts mucus production. This immune response traps and expels the virus, a concept fifth graders can grasp as the body's defense, making tissues essential for hygiene. Drinking water hydrates but doesn't cause runny noses excess fluid isn't secreted nasally. Lack of coughing or sneezing might worsen congestion but isn't the trigger mucus forms from infection, not clearance failure. Viruses don't ‘melt' into fluid; they're already microscopic, and fever aids immunity, not liquefaction. The nurse uses this cellular explanation to connect symptoms to infection, encouraging tissue use to manage mucus and curb germ spread, tailoring the lesson to young learners' understanding of flu's effects.