Correct Answer: D

Rationale: The correct answer is D, the bicarbonate-carbonic system. This buffer system is crucial in maintaining the body's pH balance. When CO2 combines with water in the blood, it forms carbonic acid, which dissociates into bicarbonate ions and hydrogen ions. Bicarbonate acts as a base, accepting excess hydrogen ions to prevent a decrease in pH. Hemoglobin and plasma proteins primarily function as transport molecules, not as buffer systems. Phosphate buffer system is present in intracellular fluids, not as commonly in the body. The bicarbonate-carbonic system is the most prevalent buffer system in the blood and plays a vital role in regulating blood pH.

Correct Answer: C

Rationale: The correct answer is C: Side lying position. This position helps prevent aspiration of secretions and promotes drainage from the mouth during and after a seizure. Placing the patient in a side lying position also helps prevent injury from falling and facilitates monitoring of the patient's airway. Incorrect choices: A: Low fowler's - This position does not provide optimal airway protection and may increase the risk of aspiration during a seizure. B: Modified trendelenburg - This position may worsen the patient's airway patency and does not facilitate drainage of secretions. D: Supine - Placing the patient in a supine position can lead to aspiration and compromise the airway, especially during a seizure. Summary: The side lying position is the most appropriate choice as it ensures airway protection, facilitates drainage, and reduces the risk of aspiration during and after a seizure.

Correct Answer: C

Rationale: The correct answer is C: Report sudden onset of acute pain. This is the highest priority because sudden onset of acute pain postoperatively can indicate a serious complication such as hemorrhage or infection. Prompt reporting allows for timely intervention to prevent further complications. A: Do not leave the patient unattended at any time - While important for safety, it is not the highest priority compared to addressing sudden onset of acute pain. B: Teach the patient not to bend over - Important for preventing complications postoperatively, but not as urgent as addressing sudden onset of acute pain. D: Apply sandbags to either side of the head - This intervention is not typically indicated for postoperative eye patients and would not address the potential serious complication of sudden onset of acute pain.

Correct Answer: C

Rationale: The correct answer is C: Fluid replacement. In end-stage AIDS with Cryptosporidium infection, the client experiences severe diarrhea leading to dehydration and electrolyte imbalances. Fluid replacement is crucial to prevent hypovolemia and maintain electrolyte balance. Adequate hydration supports renal function, prevents further complications, and aids in the elimination of the infectious agent. Pain management (A) may be needed for discomfort but is not the priority. Antiretroviral therapy (B) is essential for managing HIV but does not directly address the immediate issue of dehydration. High-calorie intake (D) is important for overall nutrition but does not address the urgent need for fluid replacement in this situation.

Correct Answer: D

Rationale: The correct answer is D because assessing for localized ischemia involves evaluating multiple factors. A: Assessing color and temperature helps determine perfusion. B: Checking capillary refill assesses circulation. C: Evaluating pulse rate indicates cardiac output. Doing all of the above provides a comprehensive assessment of arterial flow and potential ischemia. Other choices are incorrect as they do not cover all aspects necessary for a thorough assessment.