Fill in the Blanks The respiratory system fill in the gapsOnline version The respiratory system fill in the gaps by Miguel Angel Preciado Lopez 1 diaphragm bronchioles alveoli capillaries trachea lungs nose bronchi a . Air enters the body via the mouth and . b . Air travels down a tube known as the . c . This tube divides to form two taking air to each lung . d . The bronchi divide further into smaller tubes called the . e . At the end of these smaller tubes there are air sacs called the . f . These sacs are covered with small blood vessels called . g . When the muscle contracts , the lungs take in oxygen . h . When this muscle relaxes , air leaves the .
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