Nokea
Vital capacity of lungs of an average human is
- A. 3000-4500 ml
- B. 1500-1800 ml
- C. 2000-2500 ml
- D. 500-1000 ml
Correct Answer: A
Rationale: The vital capacity of lungs is the maximum amount of air a person can exhale after a maximum inhalation. The average vital capacity for an adult human is typically between 3000-4500 ml. This range allows for efficient gas exchange in the lungs. Choice B (1500-1800 ml) and Choice C (2000-2500 ml) fall below the average vital capacity, indicating limited lung capacity. Choice D (500-1000 ml) is significantly low and would not support normal respiratory function. Therefore, Choice A (3000-4500 ml) is the correct answer as it aligns with the average vital capacity range for an average human.
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The effect of pH on hemoglobin saturation is known as the
- A. Bainbridge reflex
- B. Bohr effect
- C. pulmonary reflex
- D. respiratory effect
Correct Answer: B
Rationale: The correct answer is B: Bohr effect. This effect describes how pH affects hemoglobin saturation. When pH decreases (becomes more acidic), hemoglobin's affinity for oxygen decreases, promoting oxygen unloading in tissues. This is due to the protonation of histidine residues in hemoglobin, altering its structure. The other choices are incorrect because the Bainbridge reflex is related to heart rate regulation in response to changes in blood volume, the pulmonary reflex relates to the regulation of breathing in response to changes in blood oxygen levels, and the respiratory effect is a general term that does not specifically describe the pH effect on hemoglobin saturation.
During internal and external respiration, gases move by
- A. osmosis
- B. active transport
- C. diffusion
- D. endocytosis
Correct Answer: C
Rationale: The correct answer is C: diffusion. During internal and external respiration, gases move from areas of high concentration to low concentration through passive diffusion. This process is driven by the concentration gradient, allowing gases like oxygen and carbon dioxide to exchange in the lungs and tissues. Osmosis (A) is the movement of water across a semipermeable membrane, not gases. Active transport (B) requires energy and moves substances against their concentration gradient, which is not how gases move during respiration. Endocytosis (D) is a process where cells engulf substances by forming vesicles, not how gases are exchanged in respiration.
A nurse is caring for a client using oxygen while in the hospital. What assessment finding indicates that outcomes for client safety with oxygen therapy are being met?
- A. 100% of meals being eaten by the client
- B. Intact skin behind the ears
- C. The client understanding the need for oxygen
- D. Unchanged weight for the past 3 days
Correct Answer: B
Rationale: The correct answer is B. Intact skin behind the ears indicates that the oxygen delivery device is fitted properly and not causing skin breakdown, ensuring client safety. A (meals being eaten) is not directly related to oxygen therapy outcomes. C (client understanding) is important but doesn't directly assess client safety with oxygen therapy. D (unchanged weight) is not a specific indicator of client safety with oxygen therapy.
A nurse is assessing a client who is recovering from a lung biopsy. Which assessment finding requires immediate action?
- A. Increased temperature
- B. Absent breath sounds
- C. Productive cough
- D. Incisional discomfort
Correct Answer: B
Rationale: The correct answer is B: Absent breath sounds. This finding could indicate a pneumothorax, a serious complication post lung biopsy requiring immediate intervention. Absent breath sounds suggest air accumulation in the pleural space, causing lung collapse. Prompt action is crucial to prevent respiratory distress. Increased temperature (A) may indicate infection but not as urgent as addressing a pneumothorax. Productive cough (C) is common post-procedure. Incisional discomfort (D) is expected and can be managed with appropriate pain relief measures.
Hemoglobin gives up O2 when
- A. carbon dioxide concentrations are high
- B. body temperature is lowered.
- C. pH values are high
- D. CO2 concentrations are low
Correct Answer: A
Rationale: The correct answer is A: carbon dioxide concentrations are high. When carbon dioxide levels are high, it leads to a decrease in blood pH, triggering hemoglobin to release oxygen more readily through the Bohr effect. This is a physiological response to maintain homeostasis. The other choices (B, C, D) do not directly affect the release of oxygen from hemoglobin.