Breathing is the act or process of respiration and it consists of two phases, inspiration and expiration. During inspiration, the diaphragm and the intercostals muscles contract. the diaphragm moves downwards increasing the volume of the thoracic (chest) cavity, and the intercostals muscles pull up the ribs to expand the rib cage and further increasing the volume of the alveoli (Blake, 2001). The increase of volume in the alveoli lowers the air pressure below the atmospheric pressure. …showed first 75 words of 403 total…

…showed last 75 words of 403 total…various factors including anatomical build, age, dispensability of the lungs, and the presence of respiratory disease. The more physically active the body is the more ATP energy is required. To produce more ATP energy the more oxygen must be inhaled, so therefore the breathing rate will be higher than usual (D, Galbraith). Since you are inhaling more oxygen then usual that means the body will produce more carbon dioxide which must be released during exhalation.