GAS EXCHANGE SYSTEM

• Ribs are the bone structure surrounding and protecting lungs and help breathing
• Intercoastal muscles are the muscles between ribs controlling movement causing inhalation and exhalation
• Diaphragm is a sheet of connective tissue between thorax that helps change volume of the thorax to allow inhalation and exhalation
• Trachea is the windpipe connecting mouth and nose to lungs and is lined with goblet cells and ciliated with epithelial cells
• Bronchi are the large tubes branching off trachea, one bronchus for each lung and lined with goblet cells and ciliated with epithelial cells
• Bronchioles are where bronchi split to form smaller tubes which are connected to alveoli
• Alveoli are tiny moist air sacs where gas exchange occurs and each alveolus is covered in capillaries