Do you know what is the benefit of sneezing?

Sneezing or coughing as a defensive God created it and its goal is to expel any
Foreign body (dust - smoke - viruses - bacteria) outside the respiratory tract, This is because the respiratory tract is the source of oxygen introduced into the blood, if this device holds dust or smoke toxic or Gerthoma into the blood, this would be a serious threat to life because the blood up to the heart and heart turn this pathogen whatever to all parts of the body pumps, and here the wisdom of God Almighty required to provide respiratory tract (nasal mucosa, which stimulated leads to sneezing,The mucosa of bronchitis and laryngitis, which leads Alert cough), receptors can sense the presence of any foreign substance or toxic or pollution enters the respiratory system and thus contribute through sneezing mechanism or cough to expel the harmful factor and harmful and prevent the entry to blood and then prevent the arrival of members of all.