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The respiratory, or pulmonary, system has the function to deliver oxygen to the blood, and remove carbon dioxide on the way out. Within human beings, the respiratory system is well developed and very complex. The respiratory tract consists of respiratory organs that all work together in an intricate system. The organs are:

The Nasal Cavity: A part of our nose, the nasal cavity brings in air through the external nostrils, and then sends it to the pharynx with our internal nostrils. The nasal cavity also serves the function of sifting out dust particles with mucus and the cilia as a barrier.

The Pharynx. After entering through the nasal cavity, air next goes to the pharynx. There, the pharynx opens into the larynx or voice box through the glottis. The pharynx is actually shared by the respiratory system with the digestive tract. Luckily, the glottis is usually covered by the cartilage epiglottis when we swallow food, so we donat choke.

The Larynx. The Larynx is a cartilagious structure located at the tracheal opening that resembles a box. When we swallow food, the larynx will move up or down to allow the passage of either air or food. The larynx also serves another purpose, as it contains two vocal chords to vibrate and produce sound, allowing us to speak.

The Trachea. After the larynx, thereas the trachea, which is a tube leading to the bronchi. This tube is eleven centimeters in length and twenty five in diameter. The trachea has an incomplete C-shape cartiligious ring within its wall, which prevents it from collapsing so we can keep breathing.

The Bronchi and Bronchioles: At the lower end of the trachea, are the two primary bronchi. These bronchi lead to the lungs, both to the right and left side. The right bronchus is split into three bronchi that extend separately into the three lobes of the right lung. In a complimentary fashion, the left bronchi splits into two bronchi that connect to the two lobes of the left lung.

The Lungs: Lungs are an elastic, spongy, bag like structure, that is hollow. There are two lungs, both located in the thoracic cavity. The thoracic cavity is surrounded by the vertebral column, the sternum, and the diaphragm. The diaphragm form the floor of the cavity, so they are what our lungs rest on.

As mentioned before, the right lung is separated into three lobes, whereas the left long is only separated into two lobes. The lungs are also surrounded by a narrowly shaped pleural cavity, which is in turn surrounded by two membranes. These membranes secrete an oily substance called pleural fluid, which fills the Pleural cavity.

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