Nokea
When Bohr effect occurs due to increased CO2 tension, Oxygen affinity of Hb decreases. The reason for increased CO2 tension is
- A. Increase in P50
- B. Decrease in P50
- C. High CO2 content
- D. High O2 content
Correct Answer: A
Rationale: The correct answer is A because an increase in P50 indicates a decrease in oxygen affinity of hemoglobin (Hb), as seen in the Bohr effect. When CO2 tension rises, it forms carbonic acid in the blood, leading to a decrease in pH. This decrease in pH causes a right shift in the oxygen-hemoglobin dissociation curve, resulting in lower oxygen affinity of Hb. Decreasing P50 reflects this reduced affinity. Choices B, C, and D are incorrect because a decrease in P50, high CO2 content, and high O2 content would not lead to a decrease in oxygen affinity as observed in the Bohr effect.
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Which of the following conditions is evident by persistent hoarseness?
- A. Bacterial infection
- B. Laryngeal cancer
- C. Aphonia
- D. Peritonsillar abscess
Correct Answer: B
Rationale: The correct answer is B. Persistent hoarseness is a hallmark symptom of laryngeal cancer. A (bacterial infection) may cause temporary hoarseness but not persistent. C (aphonia) refers to complete loss of voice, not hoarseness. D (peritonsillar abscess) affects the throat but does not typically cause persistent hoarseness.
Which statement is false about anatomical dead space?
- A. Anatomical dead space varies with age
- B. Can be estimated by the Fowlers method
- C. Significantly large in shallow breathing
- D. Measured by plotting N2 concentration against expired volume as in Bohr’s method
Correct Answer: D
Rationale: The correct answer is D because Bohr's method measures physiological dead space, not anatomical dead space. Anatomical dead space is constant and not affected by N2 concentration. A: Anatomical dead space does vary with age due to changes in lung dimensions. B: Fowlers method estimates anatomical dead space by measuring tidal volume and respiratory rate. C: Anatomical dead space is not significantly large in shallow breathing as it mainly involves the conducting airways, not the alveoli.
The filtering and keeping the mucus and dirt away from our lung's performed by
- A. cilia
- B. bronchioles
- C. hair in lungs
- D. all of the above
Correct Answer: A
Rationale: The correct answer is A: cilia. Cilia are tiny hair-like structures in the respiratory tract that sweep mucus and dirt out of the lungs to keep them clean. Bronchioles are small airways in the lungs through which air passes, not involved in filtering. Hair in the lungs is not a natural structure; it would be harmful. Choice D is incorrect because not all options listed are involved in filtering and keeping the mucus and dirt away from the lungs.
The function of tracheal cilia is to
- A. Pass mucus out
- B. Pass mucus in
- C. Pass air out
- D. Pass air out
Correct Answer: A
Rationale: The correct answer is A: Pass mucus out. Tracheal cilia help move mucus, which contains dust, debris, and pathogens, out of the respiratory tract to prevent infections and maintain clear airways. This process is known as mucociliary clearance. Choices B, C, and D are incorrect because tracheal cilia do not pass mucus in, pass air out, or pass air in. Tracheal cilia specifically function to clear mucus out of the respiratory tract.
You are providing care for a client with recently diagnosed asthma. What key points will you be sure to include in your teaching plan for this client? (Choose all that apply.)
- A. Avoid potential environmental asthma triggers such as smoke.
- B. Use inhaler 30 minutes before exercising to prevent bronchospasm.
- C. Wash all bedding in cold water to reduce and destroy dust mites.
- D. Be sure to get at least 8 hours of rest and sleep every night.
Correct Answer: D
Rationale: The correct answer includes A, B, and D. Avoiding triggers (A), using inhalers before exercise (B), and ensuring adequate rest (D) are important for asthma management. Washing bedding in cold water (C) is ineffective for destroying dust mites; hot water is required.