Final answer:
Respiratory arrest occurs when an individual stops breathing completely, requiring immediate medical attention to restore proper breathing.
Step-by-step explanation:
When an individual stops breathing, he or she is said to be in respiratory arrest. Respiratory arrest occurs when breathing completely stops and can be caused by various factors such as trauma, drug overdose, or respiratory disorders like sleep apnea. During respiratory arrest, immediate medical attention is needed to restore proper breathing and prevent further complications.