The respiratory system is composed of the following:
Upper respiratory vessels that allow entry of atmospheric air into the respiratory system – nose (and mouth), larynx (and pharynx) and trachea (the windpipe)
Lower respiratory airways that allow passage of atmospheric air into the lungs themselves – main bronchi and bronchioles (as conducting airways)
Final respiratory airways that allow gaseous exchange to occur – respiratory bronchioles, alveolar sacs and alveoli
Unlike the cardiovascular system, which is sealed and enclosed, the respiratory system is open to the atmosphere to allow the intake of air during breathing.
During inspiration (breathing in), atmospheric air containing about 21% oxygen is drawn into and through the system via the nose or mouth, and down into the microscopic structure of the lungs to the alveoli.
It is here that some of the oxygen is exchanged with an accumulation of carbon dioxide gas, the waste product of the body cells’ metabolic activities. The exchanged oxygen is taken away from the lungs in the circulatory system, to be used by the body during cellular activity, while the carbon dioxide is removed from the body during expiration (breathing out).
This gaseous exchange mechanism is the main function of the respiratory system.
THE THORACIC CAVITY – GROSS ANATOMY
THE RESPIRATORY SYSTEM – GROSS ANATOMY
UPPER RESPIRATORY TRACT – MICROSCOPIC ANATOMY
LOWER RESPIRATORY TRACT – MICROSCOPIC ANATOMY
ALVEOLI – MICROSCOPIC ANATOMY
GASEOUS EXCHANGE MECHANISM
RESPIRATORY MEDICAL CONDITIONS
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Definition The respiratory system consists of organs that deliver oxygen to the circulatory system for transport to all the cells of the body. Th