It travels down the trachea – or windpipe – into one of two bronchi and into bronchioles before entering one of millions of alveoli, where gaseous exchange takes place. When we breathe out ...

The bronchi then divide into smaller bronchi, which split into bronchioles. These lead to tiny air sacs known as alveoli. Alveoli absorb oxygen from the air a person inhales and pass it into the ...

Most of the parasite sections the pathologist saw microscopically in this goat were in alveoli next to the lung surface rather than being in bronchi or bronchioles (Fig. 3). Therefore, the ...