External intercostal muscle: when inhaling, the external intercostal muscle contracts, and the ribs move upward and outward, and the volume increases; When exhaling, the external intercostal muscles relax, the ribs move downward and inward, and the volume decreases.
Diaphragm: when inhaling, the diaphragm contracts, the diaphragm top drops and the chest cavity increases; When exhaling, the diaphragm relaxes, the top of the diaphragm rises and the chest contracts.
Deep breathing can make people's chest and abdomen muscles and organs exercise to a greater extent, inhale more oxygen, spit out carbon dioxide, strengthen blood circulation, and help relieve fatigue and relax mood.
Extended data
Deep breathing is the best way to relax yourself, which includes everything from simple deep breathing, yoga to meditation. Deep breathing can not only promote the oxygen exchange between the human body and the outside world, but also slow down the heartbeat and lower blood pressure. It can divert people's attention and improve their self-awareness in a depressed environment. When people know that deep breathing can keep calm, they can regain control of their emotions and relieve anxiety.
When severe stress occurs, people can take a deep breath, which is an expert's advice to those who try to overcome fear (the greatest stress). You can practice deep breathing at any time, not necessarily when you are stressed. Such as: on the way to work; Before each meal; When exercising; Before the performance
Baidu Encyclopedia-Deep Breathing (Exercise)