What is the major role of oxygen?
Maintains acid-base balance in the body
Triggers chemoreceptors in the body
All of these
Necessary for cellular metabolism
The Correct Answer is D
A. Oxygen does play a role in maintaining acid-base balance indirectly, as it is required for aerobic metabolism, which produces carbon dioxide that is regulated by the body to maintain acid-base balance. However, this is not its primary role.
B. Oxygen does trigger chemoreceptors, but this is more of a secondary function to regulate breathing based on oxygen and carbon dioxide levels.
C. While oxygen has many roles, its most critical function is providing the necessary support for cellular metabolism, which is vital for energy production in cells.
D. Oxygen is essential for cellular metabolism as it is required for the process of oxidative phosphorylation in mitochondria, which produces ATP, the energy currency of cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. A platelet count of 150,000/mm is within the normal range (150,000-450,000/mm), and while platelet count can be important in assessing for bleeding risks, it is not the most urgent value in the context of HIV.
B. A positive Western blot test confirms HIV infection but is not an acute or urgent finding. It is used for diagnosis, and the priority is to manage the ongoing health of the patient.
C. A WBC count of 5,000/mm is within the normal range (4,000-11,000/mm), so this is not an alarming value.
D. A CD4-T-cell count of 180 cells/mm is significantly low. CD4-T-cell count is a critical marker of immune function in HIV patients. A count below 200 cells/mm indicates a severely compromised immune system and places the patient at high risk for opportunistic infections. This is the most urgent value and requires immediate attention.
Correct Answer is B
Explanation
A. Overactive bladder refers to the condition where there is a sudden and uncontrollable urge to urinate, often associated with urgency and frequency, but it is not caused by exertional stimuli.
B. Stress incontinence is the type of urinary incontinence that occurs when physical activity or exertion, such as coughing, sneezing, laughing, or lifting, increases abdominal pressure and leads to involuntary leakage of urine.
C. Functional incontinence refers to the inability to reach the bathroom in time due to physical or cognitive impairments, such as mobility issues or dementia, rather than exertional triggers.
D. Urge incontinence is the sudden and intense urge to urinate, often leading to involuntary loss of urine. It is not typically caused by exertion but by an overactive bladder.
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