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The exhalation cycle typically ends when the respiratory muscles, particularly the diaphragm and intercostal muscles, relax, leading to a decrease in thoracic cavity volume. This decrease in volume increases the pressure inside the lungs, causing air to flow out of the lungs. Exhalation continues until the pressure in the lungs equalizes with the atmospheric pressure. The cycle can also be influenced by factors such as the body's metabolic needs and reflex actions.

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