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Trachea has stiff rings of cartilage to prevent it collapsing Bronchi Bronchioles Rib muscles to raise and lower the ribs Ribs to protect the chest Lung Alveoli (air sacs) gas exchange takes place here Diaphragm muscular sheet Alveoli are very good at exchanging gases because They have a LARGE surface area They have a good blood supply They are moist This picture shows cilia on the cells lining the airways

Danny Brown's clean slate 'Quaranta' finds the 42-year-old rapper cleareyed, meditative and remorseful Age has always been embedded into the narrative of Danny Brown's music

Cigarette smoke can activate the complement cascade in retinal cells

One chemical that has raised significant alarm in the vaping community is diacetyl, a flavouring compound once commonly used in e-liquids

Humidity will be more evenly distributed