Correct Answer: A

Rationale: The correct answer is A because pain and anxiety trigger the sympathetic nervous system's fight-or-flight response, increasing heart rate, blood pressure, and stress hormones to prepare the body for potential danger. This physiological response helps the individual respond to perceived threats. Choices B, C, and D are incorrect because pain and anxiety typically increase stress levels, do not necessarily remove one from harm, and can hinder rather than enhance performance due to distraction and decreased focus.

Correct Answer: A

Rationale: The presence of protein in the glomerular filtrate indicates a problem with renal function because in healthy kidneys, proteins are retained in the blood and not filtered into the urine. If protein is found in the filtrate, it suggests damage to the glomerular filtration barrier. Sodium, creatinine, and red blood cells are normally present in the filtrate and are not indicative of renal dysfunction. Sodium is freely filtered and reabsorbed, creatinine is a waste product of muscle metabolism excreted by the kidneys, and a small number of red blood cells may be filtered due to their small size. Therefore, protein in the glomerular filtrate is the most specific indicator of renal dysfunction.

Correct Answer: A

Rationale: The correct answer is A: high Fowler's position. This position promotes optimal lung expansion by allowing the chest to expand fully, improving oxygenation. It also helps reduce the work of breathing. Side lying with the head of the bed elevated (B) may not provide the same level of lung expansion. Sitting in a chair (C) may not be suitable for a patient in acute respiratory failure as it may not provide adequate support for breathing. Supine with the bed flat (D) can worsen respiratory distress by limiting lung expansion.

Correct Answer: D

Rationale: The correct answer is D: Instill 5 mL of sterile saline into the ET before suctioning. This intervention helps to loosen and mobilize the thick secretions, making them easier to remove during suctioning. It is important to moisten the secretions to prevent mucosal damage and trauma during suctioning. A: Increasing suctioning frequency can lead to mucosal damage and increased risk of infection. B: Repositioning helps with ventilation and preventing pressure injuries, but it does not directly address the thick secretions. C: Adding water to enteral feedings will not directly address the thick secretions in the ET. In summary, instilling sterile saline into the ET before suctioning is the most effective intervention as it helps to loosen and mobilize thick secretions, making suctioning more effective and reducing the risk of mucosal damage.

Correct Answer: D

Rationale: Step 1: Restlessness is an early sign of hypoxemia due to the body's response to low oxygen levels. Step 2: Restlessness occurs as the body tries to increase oxygen intake. Step 3: Other choices are incorrect because clubbing and cyanosis are late signs, while hypotension is not a specific early sign of hypoxemia.