Final answer:
The use of neuromuscular blocking agents in the RSI procedure allows the patient to tolerate longer periods of apnea.
Step-by-step explanation:
The step in the RSI (Rapid Sequence Intubation) procedure that allows the patient to tolerate longer than normal periods of apnea is the use of medications called neuromuscular blocking agents. These medications temporarily paralyze the muscles, including the muscles involved in breathing, which allows the healthcare provider to secure the patient's airway and perform intubation. By eliminating muscle movement, the patient can tolerate longer periods of apnea without experiencing distress.