Beginning of Essay
Respiration is the process of taking in and using oxygen. There are three different phases of respiration: external respiration, internal respiration, and cellular respiration. External respiration is the intake of oxygen from the environment and the release ....

Middle of Essay
.... emotional upsets. A typical asthma attack begins with coughing, wheezing, and shortness of breath. Some people have dry coughing as the only symptom. Attacks usually last only a couple hours. An attack may happen again in hours to even years after the first attack. Asthma attacks can be treated and prevented by the use of drugs. Albuterol or terbutaline, which can bring relief within minutes, is the usual treatment. The common cold is another disease of the respiratory system. The cold affects the mucous membranes of the nose and throat. It causes nasal congestion, sore throat, and coughing. A cold usually lasts up to an average ....