Answer:
Air enters the left lung of a human being through a process called respiration. During inhalation, the diaphragm and intercostal muscles contract, which causes the volume of the chest cavity to increase. As a result, the pressure inside the chest cavity decreases, causing air to flow into the lungs from the atmosphere through the trachea and bronchial tubes. The bronchial tubes then divide into smaller and smaller airways called bronchioles, which eventually lead to the alveoli, which are the tiny air sacs in the lungs where gas exchange occurs. Oxygen from the inhaled air diffuses into the bloodstream through the walls of the alveoli, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled during exhalation. The left lung and right lung are separated by the heart and located in the thoracic cavity, with the left lung being smaller than the right lung to accommodate for the space taken up by the heart.
Step-by-step explanation: