biology

• Human respiratory system


  Responsible for the exchange of gases between humans and the environment
• Lungs


  The vital organ responsible for breathing particularly gas exchange
• Heart


  Supplies our cells with oxygen
• Right atrium

  It accepts blood from the body
• Left atrium


  It accepts blood from the lungs
• Right ventricle


  It pumps blood towards the lungs
• Left ventricle


  It pumps blood towards the body
• Vena cava


  The largest vein, it carries blood toward the heart
• Superior vena cava


  Conveys blood from the upper extremities towards the heart
• Inferior vena cava


  Conveys blood from the lower extremities towards the heart