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The structure of the human respiratory system

The respiratory system

Respiratory system

Respiratory system

The human respiratory system consists of the nose , the pharynx , the trachea , two bronchi and two lungs , It is called also the respiratory apparatus , the ventilatory system and it is used for the process of the respiration in the organisms .

The nose

The nose is very important in our respiratory system as it is the first part of  the respiratory system , through it the air enters the body , and it is lined with the mucus layer and hairs to filter the air from the dust and the microbes before entering the lungs .

The function of the nose is very important as it is lined with the blood capillaries to warm the air before entering the lungs ,  so  , we should breathe through the nose not through the mouth .

The pharynx

You should know that the pharynx is an important as it is connected to the esophagus , So it is a common cavity between the digestive system and the respiratory  system  .

The trachea

Trachea and larynx

The structure of the trachea and the larynx

The trachea is very important in the respiratory system as it is a cartilaginous tube that is existed in the thoracic cavity , You should know that there are the larynx and the epiglottis at the top of the trachea .

The larynx ( the voice box ) is very important in our respiratory system as it contains the two vocal cords which vibrate to produce the sound .

The epiglottis lies at the top of the larynx , and it closes the larynx or the trachea during the swallowing to prevent the food from entering the trachea .

The bottom of the trachea is branched into two narrow tubes called ( bronchi ) which enter the two lungs ( one bronchus in each lung ) .

The trachea is lined with the cilia to eject up the strange objects  , It is supported by incomplete cartilaginous rings to be permanently opened for breathing  .

The two lungs

The two lungs occupy the thoracic cavity , they are surrounded by ribs ( rib cage ) and they have air sacs ( the alveoli ) in which gases exchange takes place , The walls of the alveoli and the blood capillaries are very thin to permit the exchange of gases .

The lungs are very important in the respiratory system  , Each lung contains bronchus which is divided into bronchioles  , The bronchioles end in tiny air sacs called the alveoli that are surrounded by networks of blood capillaries .

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