respiratory system

• Nasal cavities


  • Brings air into the body
  • Nasal hairs in nostrils trap dust
  • Warms and moistens air
  • Glands that produce sticky mucus line the nasal cavity
  • Mucus traps dust, pollen, and other materials that were not trapped by nasal hairs
  • Cilia sweep mucus and trapped materials out
• Pathway of oxygen from the atmosphere to the alveoli

  1. Nasal cavities (or oral cavity)

  2. Pharynx

  3. Trachea

  4. Primary bronchi (right & left)

  5. Secondary bronchi

  6. Tertiary bronchi

  7. Bronchioles

  8. Alveoli (site of gas exchange)

  
• Energy from food


  Food provides the body with the energy released during cell respiration
• Calorific value


  The amount of energy provided by a food
• Different foods provide amounts of energy