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Respiratory System –

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    The respiratory system is responsible for supplying our bodies with oxygen. This is done through respirations. There are two different respirations the external and the internal. The external respiration is the exchange of air between the lungs. This happens when oxygen is inhaled into the sacs of the lungs. Precisely at that time passes into tiny blood vessels surrounding the sacs, and at the same time carbon dioxide a gas passes from the blood vessels into the sacs for the lungs to exhale. While external respirations are taking place outside the body the internal respiration is taking place inside the body, what is happening here is the exchange of gas at the cell level within our body. Oxygen passes out of the blood vessels and into the tissues cells and carbon dioxide passed from the blood vessels into the lungs for exhale.
    The anatomy of the respiratory system starts with the nose and passed through the nasal cavity. The nasal cavity is lined with mucous membrane and fine hairs called cilia to help filter out foreign bodies. There is also the paranasal sinuses they are hollow, air containing spaces with also have mucous membrane. The sinuses also lighten the bones on the skull to produce sound.
    After the air has passed thru the nasal cavity the air goes to the pharynx which is divided into three parts. The nasopharynx which contain the pharyngeal tonsils and the adenoids these are lymphatic tissues. The second division pharynx is the oropharynx which is located below the nasopharynx and contains two round mass of lymphatic tissues known as the palatine tonsils. The third division of the pharynx is the laryngopharynx which divides into the larynx and the esophagus. The job is the laryngopharynx is a passage way for the food from the mouth and air from the nose. The larynx contains the vocal cords and the esophagus leads into the stomach where food is digested once traveling through the esophagus. The epiglottis is a flap of cartilage attached to the.

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