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Respiratory System . Angieleana Soto Davian Rivera. Functions of the Respiratory System . Breathing- the movement of air into and out of the lungs. Breathing enables your respiratory system to take in oxygen and to eliminate carbon dioxide. . Taking in oxygen .

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Respiratory system

Respiratory System

Angieleana Soto

Davian Rivera

Functions of the respiratory system
Functions of the Respiratory System

  • Breathing- the movement of air into and out of the lungs. Breathing enables your respiratory system to take in oxygen and to eliminate carbon dioxide.

Taking in oxygen
Taking in oxygen

  • The respiratory system is a system of organs that bring oxygen to your body. Oxygen is very important, your brain will tell your body t breathe even if you don’t want to. Every cell in your body needs oxygen for a series of chemical reactions called cellular respiration. During this process oxygen and sugars react, this reaction releases energy a cell can use.

Eliminating carbon dioxide
Eliminating carbon dioxide

  • Your respiratory system removes carbon dioxide and other waste gasses from your body. If these wastes were not removed, cells couldn’t function.

Organs in the respiratory system
Organs in the respiratory system

  • Air enters through the nose and mouth. The air is warmed and moistened through the nose. Hairs and mucus help trap dust and dirt from the air. Cilia line the nose and most other organs in the respiratory system. Wavelike motions carry trapped particles away from your lungs. Cilia help prevent harmful particles from going far in the system.

Organs in the respiratory system1
Organs in the respiratory system

  • Pharynx-tube-like passageway at the top of the throat that receives air, food, and liquids from the mouth or nose.

  • Larynx- air passes from the pharynx into a triangle-shaped area called the voice box.

  • Trachea- a tube held open by C-shaped rings of cartilage.

Organs in the respiratory system2
Organs in the respiratory system

  • Bronchi- the trachea branches into narrower tubes that lead into the lungs.

  • Lungs- main organs of the respiratory system.

  • Alveoli- microscopic sacs or pouchesand where gas exchange occurs.


  • Air passes from the nose and mouth into the throat through the pharynx. The epiglottis is a flap of tissue at the lower end of the pharynx. The epiglottis keeps food and liquids from entering the rest of the respiratory system.

Larynx and trachea
Larynx and trachea

  • Air passes from the pharynx into the larynx. The vocal cords, two thick folds of tissue in the larynx, vibrate and make sounds as air passes over them. Then the air enters the trachea.

Bronchi and lungs
Bronchi and lungs

  • The trachea branches into narrower tubes, called bronchi, that lead to the lungs. Inside the lungs the bronchi continues to branch into smaller and narrower tubes, called bronchioles.


  • In the lungs, the bronchioles end in the alveoli, this is where gas exchange occurs. During gas exchange, oxygen from the air moves into the blood and carbon dioxide moves from your blood into the alveoli. Alveoli get filled with air when you breathe in. When you breathe they contract and expel air. Every time you breathe, your alveoli enable your body to take in billions of oxygen molecules and get rid of billions of carbon dioxide molecules.

Breathing and air pressure
Breathing and Air Pressure

  • When high levels of carbon dioxide build up n your blood, the nervous system signals your body to exhale. After every time you exhale you inhale.

  • Diaphragm- a large muscle below the lungs, that contracts and relaxes and moves air in and out of your lungs.

Breathing and air pressure1
Breathing and Air Pressure

  • The movement of your diaphragm causes changes in the air pressure inside your chest, this is why breathing occurs.

  • During inhalation, your diaphragm contracts and moves up, this enlarges the space around your lungs. This reduces air pressure in your chest. Air rushes inside your lungs until the pressure inside and outside your chest is equal.

Breathing an air pressure
Breathing an Air Pressure

  • During exhalation, it is the opposite as in inhalation. The diaphragm relaxes and moves up, this reduces the space around your lungs. The air pressure in your chest increases and waste gasses rush out of your lungs.

Respiratory health
Respiratory Health

  • Some respiratory illnesses make breathing difficult or uncomfortable and may become life-threatening. The best way to maintain good respiratory health is to stay away from irritants and air pollution. Don’t smoke and also, avoid secondhand smoke. When air quality is poor or pollen counts are high, it is best to stay indoors.

The respiratory system and homeostasis
The Respiratory System and Homeostasis

  • During breathing the muscular system and the respiratory system interact. This brings oxygen to your lungs and removes the carbon dioxide. This and other systems help maintain homeostasis.

Song and video
Song and Video