Nokea
The partial pressure of carbon dioxide in the interstitial space of peripheral tissues is approximately
- A. 35 mm Hg
- B. 45 mm Hg
- C. 55 mm Hg
- D. 70 mm Hg
Correct Answer: B
Rationale: The correct answer is B (45 mm Hg) because the partial pressure of carbon dioxide in the interstitial space of peripheral tissues is around 40-45 mm Hg. This value is higher than in the arterial blood (around 40 mm Hg) due to the production of CO2 by tissues. Choice A (35 mm Hg) is too low for interstitial CO2 levels. Choice C (55 mm Hg) and D (70 mm Hg) are too high and not consistent with normal physiological values. Overall, the correct answer aligns with the typical range of interstitial CO2 pressure in peripheral tissues.
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If PO2 increases
- A. saturation goes up and hemoglobin stores oxygen
- B. hemoglobin stores oxygen
- C. hemoglobin gives away oxygen
- D. saturation goes up
Correct Answer: A
Rationale: Step 1: Increased PO2 leads to higher oxygen levels in blood.
Step 2: Higher PO2 causes hemoglobin to become fully saturated with oxygen.
Step 3: Fully saturated hemoglobin stores more oxygen.
Step 4: Therefore, as PO2 increases, saturation goes up and hemoglobin stores more oxygen. Other choices are incorrect because they do not align with the relationship between PO2, hemoglobin saturation, and oxygen storage in the blood.
In which part of the body Mycobacterium tuberculosis affects
- A. Lungs
- B. Skin and Meninges
- C. Intestine
- D. All these
Correct Answer: D
Rationale: The correct answer is D. Mycobacterium tuberculosis primarily affects the lungs, causing tuberculosis. However, it can also spread to other parts of the body, such as the skin, leading to cutaneous tuberculosis, and the meninges, causing tuberculous meningitis. It can also affect the intestines, causing gastrointestinal tuberculosis. Therefore, the correct answer is D, as Mycobacterium tuberculosis can impact multiple parts of the body. Choice A (Lungs) is correct but does not encompass all the affected areas. Choices B (Skin and Meninges) and C (Intestine) are incorrect as they do not cover all the possible sites of infection by Mycobacterium tuberculosis.
The chief difference between Trachea and Bronchioles is
- A. Trachea lacks cartilage
- B. Bronchiole lacks cartilage
- C. Trachea is long
- D. Bronchiole is small
Correct Answer: B
Rationale: The correct answer is B: Bronchiole lacks cartilage. The trachea is a part of the conducting airway that contains C-shaped cartilage rings for structural support, while bronchioles are smaller airways that lack cartilage. Bronchioles are primarily composed of smooth muscle, allowing for dynamic changes in airway diameter. Choices A, C, and D are incorrect because the trachea does contain cartilage, the length of the trachea does not differentiate it from bronchioles, and the size of the bronchioles alone does not define the chief difference between trachea and bronchioles.
The nurse is caring for a patient who has just returned to the unit after a colon resection. The patient is showing signs of hypoxia. The nurse knows that this is probably caused by what?
- A. Nitrogen narcosis
- B. Infection
- C. Impaired diffusion
- D. Shunting
Correct Answer: D
Rationale: The correct answer is D: Shunting. Hypoxia after a colon resection is likely due to shunting, which is a condition where blood bypasses the normal oxygenation process in the lungs, leading to decreased oxygen levels in the blood. Shunting can occur due to factors such as collapsed alveoli or blood vessel blockages.
Nitrogen narcosis (A) is not related to hypoxia but rather occurs in scuba divers exposed to high partial pressures of nitrogen. Infection (B) may cause fever and inflammation but is not the primary cause of hypoxia in this scenario. Impaired diffusion (C) refers to issues with gas exchange in the alveoli and is not the most likely cause of hypoxia after a colon resection.
When examining the posterior pharynx and tonsils, which of the following objective data does the nurse note?
- A. Difficulty in sneezing
- B. Suppressed gag reflex
- C. Deformities
- D. Inflammation
Correct Answer: D
Rationale: The correct answer is D. Inflammation is a key finding during examination of the posterior pharynx and tonsils, especially in infections such as tonsillitis. A (difficulty in sneezing) is unrelated to pharyngeal assessment. B (suppressed gag reflex) might indicate neurological issues but isn't typically noted during routine exams. C (deformities) is rare unless there's structural abnormality.