Science 6 Quarter 2 Week 1 (Respiratory System)

• The respiratory system is responsible for the exchange of gases (oxygen and carbon dioxide) in the bloodstream, the body cells, and the atmosphere
• Breathing process is essential to both human and animals in order to live
• The process of exchanges of gases with the environment is called respiration
• Respiratory system


  • Intake of oxygen and its delivery to the cells of the different parts of the body
  • Release of carbon dioxide
• Main parts of the respiratory system

  • Nasal cavity
  • Pharynx
  • Larynx
  • Trachea
  • Bronchi
  • Bronchioles
  • Alveoli
  • Lungs
  • Diaphragm
• Nasal cavity


  • Nostrils are the opening into the nasal passages that are lined with hairs
  • Glands produce sticky mucus to trap dust, pollen and other materials
• Pharynx


  • Also called the throat
  • Common passageway for both food, water and air
• Larynx


  Contains two vocal cords that vibrate when air passes by them
• Trachea


  • Also known as the windpipe
  • Filters the air we inhale
  • Branches into the bronchi
• Bronchi


  Two tubes that carry air into the lungs
• Bronchioles


  Smaller tubes that branch off into alveoli
• Alveoli


  • Grape-like structures at the end of each bronchiole
  • Surrounded by capillaries
  • Exchange of oxygen and carbon dioxide takes place between the alveoli and capillaries
• Lungs


  • Main organ of the respiratory system
  • Where exchange of gases occurs
• Diaphragm


  • Dome-shaped muscle that controls breathing
  • Located at the bottom of the lungs
  • Contracts and moves down when inhaling to allow air to move into the lungs
  • Expands when exhaling to reduce the amount of space for the lungs and force air out
• Circulation of oxygen


  Starts from the nostril, goes through the pharynx and larynx, down to the trachea, bronchi and bronchioles, and lastly to the alveoli where the exchange of oxygen and carbon dioxide takes place
• Carbon dioxide


  Dióxido de carbono
• Oxygen


  Oxígeno
• Respiration


  Respiración
• The respiratory system works together to circulate oxygen throughout the body
• Breathing is very important in life
• Bronchial tubes are smaller branches of the bronchi, which lead to alveoli.