Respiratory system

• The trachea is the windpipe, which connects to the larynx.
• The bronchi are two tubes that branch off from the trachea into the lungs.
• Bronchial tree refers to the network of airways within the lungs.
• Alveoli are tiny sacs where gas exchange occurs between blood vessels and alveolar walls.
• Lungs contain millions of alveoli.
• Oxygen diffuses across the thin wall of an alveolus and enters capillaries surrounding it.
• Includes of :

  Larynx

  Trachea

  Lungs

  Intercostal muscles

  Ribcage

  Bronchi

  Heart

  Branches

  Alveoli

  Diaphgram
• What happens to the diaphragm when you breathe in and out

  Contracts and flattens

  Relaxes and moves up
• What is gas exchange ?

  When oxygen enters the blood and carbon dioxide enters the lungs from the blood