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 C
Explanation
A. Weakness, vomiting, hypotension, and mental confusion may occur in cases of diabetic ketoacidosis (DKA), but these are more acute signs of severe complications rather than early symptoms of type 1 diabetes.
B. Vomiting, abdominal pain, sweet fruity breath, dehydration, and Kussmaul breathing are signs of diabetic ketoacidosis (DKA), a serious complication that typically develops after the onset of type 1 diabetes, not early symptoms.
C. Polydipsia (excessive thirst), polyuria (frequent urination), polyphagia (excessive hunger), weight loss, and fatigue are classic early signs and symptoms of type 1 diabetes due to the body's inability to regulate blood glucose levels properly.
D. Recurrent infections, visual changes, and paresthesia (numbness or tingling) are typically associated with long-term, poorly controlled diabetes, not early signs of type 1 diabetes.
Correct Answer is B
Explanation
A. Needle thoracentesis is typically performed in cases of pneumothorax or pleural effusion, not asthma exacerbation. The symptoms described do not indicate a pleural space issue that would require thoracentesis.
B. Emergency intubation may be necessary if the asthma exacerbation is severe and unresponsive to initial interventions such as bronchodilators, corticosteroids, and oxygen therapy. The patient's symptoms of severe dyspnea, accessory muscle use, and wheezing suggest respiratory distress, and intubation may be required to secure the airway and assist with ventilation.
C. Pleurodesis is a procedure used to treat recurrent pleural effusions, not asthma exacerbations. It involves the obliteration of the pleural space, which is not relevant to the current situation.
D. Chest tube insertion is typically performed for pneumothorax or other issues involving the pleural space, not for asthma exacerbation. The described symptoms do not suggest the need for a chest tube.
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