Breathing system

• Is the rib cage a rigid structure-

  No, The rib cage is not a rigid structure it allows inward and outward movement.
• Does the air we breathe in have more or less oxygen

  than the air we breathe out?

  The air we breathe in has more oxygen as it comes from the lungs. the air we breathe out has less oxygen because of gas exchange in the alveoli

  and oxygen being used for respiration.
• What happens When a person breathes in

  When we breathe into your nose the diaphragm contracts and moves

  down and when we breathe in air also fills our lungs this is carried from the trachea then to the bronchioles. The bronchioles carry the air to the alveoli were oxygen passes into the bloodstream diffusion also occurs in the alveoli are the natural movement of high and low concentration gas.
• Is nitrogen needed in the body

  Nitrogen isn't needed in the body therefore we inhale and exhale the samel)

  amount to 78% into our lungs.
• How gaseous exchange takes place in the lungs

  CO2 leaves the lungs and oxygen enters the lungs then it goes to the alveoli which allows diffusion.
• Gas exchange

  
• • Oxygen in the air diffuses into the bloodstream.
  • CO2 diffusers back into the air from the bloodstream

  
• Nose/mouth - allows air to be inhaled /purifies air - hair/traps and filters dust.

  Epiglottis- prevents food from going down trachea.

  Trachea - allows air into lungs - then into the bronchi - the two parts attached to lungs

  Brochioles - carries air to the alveoli
• Pharynx - top - junction of both air and food
• Larynx - voice box
• Trachea - It passes air down into the lungs - wind pipe
• Cartilage - rings that keep the trachea open
• Bronchi- 2 tubes that divide into left and right of the lungs
• bronchioles-Bronchioles carry air to and

  from the air-sacs, or alveoli.
• Each lung contains millions of tiny air-sacs called alveoli. - gas exchange
• rib cage - protects delicate organs.

  intercostal muscle - prevents friction
• Diaphragm - muscle that helps to inhale and exhale/ diaphragm is a sheet of muscle that forms the base of the chest.