Mammals Crossword

Chief organ for respiration
Breathing is dependent upon the rib and the ______________.
Inhalation happen when the rib cage ____________ and the diaphragm flattens and moves downwards.
The drop in air ___________________ inside the lung makes the outside air rush in.
Exhalation the ___________________ and the rib muscles relax.
The ____________________ of the lungs increase the air pressure and forces the air flow out.
Most mammals are_____________________.
The air is filtered by _________ and mucus membranes.
Air then reaches the __________________
Air reaches the _________________ and closes upon swallowing to prevent food from being inhaled.
The ___________________ is a long structure of soft tissue.
Each _______________ divides into increasingly smaller branches.
The smallest branches are called the ________________.
Tiny air sac