Exhalation happens in the event the diaphragm relaxes, returning to its dome condition and pushing air out from the lungs. This rhythmic contraction and peace are essential for maintaining standard respiration and guaranteeing adequate oxygen offer to the human body.Thi?t b? ho?t ??ng không s? d?ng ?i?n n?ng nên giúp ti?t ki?m ???c m?t kho?n chi