Don

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Dont Smoke!
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Emphysema
Lung Cancer
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THE PATHWAY OF AIR
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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

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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.

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3. Trachea

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

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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)

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Epiglottis

• A flap of tissue that covers the trachea when you
  swallow so food doesn't enter

Trachea
Esophagus
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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.

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5. Bronchioles

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

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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.

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Gas Exchange in the Alveoli
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Exit Ticket Choose one

• Summarize what you have learned today
• Why do we breathe?
• Why is smoking so dangerous for your respiratory
  system?