A nurse should perform an ongoing assessment of which system throughout the entire examination?

Throughout the entire physical examination, the nurse should continuously monitor the respiratory system to ensure the client maintains adequate oxygenation and ventilation. Rationale: The respiratory system requires ongoing assessment because it reflects the client’s immediate ability to oxygenate tissues and maintain life. Changes in positioning, exertion, anxiety, or underlying pathology can rapidly alter respiratory status, making it the most critical system to monitor continuously during any assessment. Respiratory compromise can develop suddenly and may present with subtle early signs such as increased work of breathing, use of accessory muscles, nasal flaring, changes in speech pattern, or altered respiratory rate and depth. Because these changes can occur at any point during the examination, not just during focused chest assessment, the nurse must maintain constant vigilance. Additionally, certain examination procedures such as palpation or repositioning may unintentionally affect breathing effort, particularly in older adults or clients with chronic respiratory or cardiac conditions. Continuous observation allows the nurse to detect early deterioration and intervene promptly. Unlike other body systems that are assessed in a segmented or region-specific manner, the respiratory system reflects real-time physiologic stability. Therefore, it is monitored throughout all stages of the examination, from initial contact to completion of the assessment.