The Nasal Passages.
Are two passages made up of cartilage through which the air is drawn into the body. They contain Goblet cells which produce mucus and cilia cells which keep the mucus moving. Mucus traps and prevents infections from entering the body. The nasal passages also moisten and warm air before it enters the Pharynx.
Pharynx.
This is the space behind the nasal cavity and above the Larynx.
Epiglottis.
Small flap of tissue that covers the trachea during swallowing to prevent foreign objects from entering and causing choking.
Larynx.
Also known as the voice box. It has two membranes and air passes through causing the vocal cords to vibrate and produce sound.
Trachea.
The Trachea is the airway also known as the windpipe. It is kept open by the rings of cartilage in its walls and allows the air to pass into the lungs.
Bronchi.
The Trachea splits into two tubes called Bronchi.
Bronchioles.
This is where the Bronchi branch off into smaller and more extensive tubes inside the lungs.
Alveoli.
Many small sacks at the end of the Bronchioles where gaseous exchange takes place. The walls of the Alveoli are only 1 cell thick to allow for the diffusion of oxygen and carbon dioxide and are numerous to provide greater surface area for gaseous exchange.
Lungs.
Located on either side of the heart. The right Lung has 3 sections and the left only 2. This enables room for the heart to sit in a space known as the cardiac notch. They are surrounded by a pleural membrane and in between is a pleural fluid that both protect the lungs from friction.
Ref:- Image from www.andrewparisi.com/tobacco/images/respiratorysystem.jpg
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