Muscle that works in the opposite direction to another muscle; (a)  

e.g. diaphragm and abdominal muscles

The two main branches of the trachea, with cilia and cartilage rings, they go into the lungs and further divide into the bronchioles (a)  

A large, dome-shaped muscular membrane that contracts, increases the volume of the thorax and lowers air pressure in the lungs causing inspiration; (a)  

A disease that progressively destroys the walls of the alveoli making breathing difficult; (a)  

The abdominal muscles contract causing reduced thorax volume. Does it happen during expiration or inhalation? (a)  

Muscles found between the ribs. They are can move the rib cage up or down. (a)  

Cells that make up alveoli in lungs (2 types) They assist in gas exchange and in the secretion of pulmonary surfactant.

(a)  

An instrument for measuring the volume of air entering and leaving the lungs; (a)  

The thin-walled tube, with cilia and mucus glands, that connects the larynx to the bronchi; also called the windpipe; (a)