Respiratory system

• Breathing isn't respiration, but it does provide the necessary oxygen for respiration to happen in our cells
• The air we inhale moves down the trachea into the bronchi then bronchioles and ends up in the alveoli.
• alveoli


  • tiny air sacks where it defuses into the blood vessels around it
  • found on the tips oh bronchioles (in the lungs)
  • they are bumpy meaning they have a large surface area to allow gas exchange to occur at a fast rate.
• • the oxygen diffuses into the blood stream and then binds to the haemoglobin (a protein in red blood cells that carries oxygen throughout the body and gives blood its red colour) in red blood cells to be transported
  • they then transport it into every cell in the body to be used for respiration
  • carbon dioxide made from respiration is dissolved into the plasma of the blood
  • which then diffuses into the blood and is exhaled (it is the same for water)