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www.reference.com/article/main-parts-respiratory-system-ab85534e0ef7aaf0

Main parts of the human respiratory system include the mouth, nasal cavity, lungs, bronchial tubes, diaphragm and trachea, according to National Heart, Lung, and Blood Institute. Other facets of the respiratory system are the larynx, epiglottis, alveoli and the blood ve...

www.reference.com/article/respiratory-system-d102e5e0695675f8

The respiratory system is a group of organs that provide the body with oxygen. Oxygen is needed for cells in the human body to live.

www.reference.com/article/respiratory-system-work-efb7efbe82695b2b

The respiratory system draws in fresh air from the environment, exchanges oxygen for waste gases in the lungs and expels the spent air back into the environment before taking another breath. The oxygen is then circulated through the body to fuel the metabolism of the ce...

www.reference.com/article/body-parts-form-human-respiratory-system-4915dc25d4672a78

The human respiratory system consists of the nasal cavity, pharynx, trachea, various divisions of the bronchi and two lungs. Air flows through the nose or the mouth into the pharynx, through the trachea, down the right and left bronchi and then through the smaller bron...

www.reference.com/article/function-respiratory-system-3cdbc8ff623fcb8a

The primary function of the respiratory system is to provide oxygen to every part of the body through the process of inhaling oxygen and exhaling carbon dioxide. The respiratory system consists of tissues and organs inside the body that allow people to breathe. This sys...

www.reference.com/article/need-respiratory-system-5a74dfd91946a985

Humans need a respiratory system because it is made up of organs that allow them to breathe. Breathing delivers oxygen to the body and takes away carbon dioxide. Every cell in the body needs oxygen to obtain energy from food.

www.reference.com/article/diseases-respiratory-system-d32c54e8dea8f19e

Some common respiratory diseases include asthma, cystic fibrosis, chronic bronchitis and emphysema. Smoking, infections and genetics are responsible for most diseases of the respiratory system, according to WebMD.