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THE PATHWAY OF AIR

THE PATHWAY OF AIR. 1. Nasal Cavity (or oral cavity). Air enters the body through the nostrils (your nose) most of the time It is lined with a ciliated mucus membrane which filters, warms, and moistens the air. 2. Pharynx.

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THE PATHWAY OF AIR

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  1. THE PATHWAY OF AIR

  2. 1. Nasal Cavity(or oral cavity) • Air enters the body through the nostrils (your nose) most of the time • It is lined with a ciliated mucus membrane which filters, warms, and moistens the air

  3. 2. Pharynx • Where the oral cavity (your mouth) and the nasal cavity (your nose) meet. • When you breathe through your mouth, air enters the pharynx.

  4. 3. Trachea • The main airway in the human respiratory system. • It contains rings of a tough tissue (cartilage) which keep the trachea open.

  5. Larynx • Also known as the voice box. • It is made of cartilage and is located at the upper end of the trachea. • When air passes over it, it vibrates. (hum so I know you are reading this)

  6. Epiglottis • A flap of tissue that covers the trachea when you swallow so food doesn't enter Trachea Esophagus

  7. 4. Bronchi Bronchi is plural. Both bronchi Bronchus is singular. One bronchus. • Two tubes that branch off the trachea. • The bronchi are ringed with cartilage. • Each bronchus extends to the lungs where the tubes become smaller.

  8. 5. Bronchioles • Smaller and smaller passageways that extend from each bronchus. • The bronchioles are found in the lungs and not ringed with cartilage.

  9. 6. Alveoli • Oxygen leaves the alveoli, enters the red blood cells and is returned to the heart to be pumped to all your body cells. • Carbon dioxide is exhaled when you breathe out. • The lungs are made of about 300 million of these tiny air sacs. • When you breathe in air fills the alveoli.

  10. Gas Exchange in the Alveoli

  11. Don’t Smoke!

  12. Emphysema Lung Cancer

  13. Exit Ticket • Summarize how and why we breathe.

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