Adigun hafsat oluwabusola
19/MHS06/031
Medical laboratory science
ANA 204
    QUESTION
 Explain the histological basic of upper respiratory system (conducting portion of the respiratory system) attacked by corona virus.
   The respiratory tract is the part of the anatomy of the respiratory system, it is lined with respiratory mucosa or respiratory mucosa or respiratory epithelium. air is taken in through the nose or the mouth, in the nasal cavity, a layer of nasal mucosa acts as a filter and traps pollutants or other harmful substances found in the air. air moves into the pharynx, a passage that contains the intersetion between the oesophagus and the larynx. the opening of the larynx has a special flap of cartilage, the epiglottis, that opens to allow air to pass through but closes o prevent food from moving into the airway. from the larynx, air moves into the trachea and down to the intersection known as the carina that branches  to form the right and left primary bronchi. each of these bronchi branches into a secondary (lobar) bronchus that branches into tertiary (segmental) bronchi, that branches into smaller airways called bronchioles that eventually connect with tiny specialized structures called alveoli that function in gas exchange. the lungs which are located in the thoracic cavity, are protected from physical damage by the ribcage. The lungs are encased in a serous membrane  that folds in on itself to form the pleurae, a two layered protective barrier. the inner visceral pleurae covers the surface of the thoracic cavity. The pleurae enclose a cavity called  the pleural cavity that contains pleural fluid. this fluid is used to decrease the amount of friction that lungs experience during breathing.
      The lungs which is the main organ affected by the coronavirus, suffers more from the virus and gives a limit to the proper functioning of the respiratory tract. other oragns are also affected by the virus, starting from when a person places the hand full of droplets from an infected person's cough, sneeze or breathe and places it on the eye, nose or mouth. They could be in the air or a surface that you touched before touching your nose, eye, or mouth. which gives the virus the passage to the mucous membrane in the throat. The virus moves down the respiratory tract,  the airway that includes the the mouth, nose, throat, and lungs. the lower airways have more ACE2 receptors than the rest of the respiratory tract.