Shows readers how our respiratory system works.

Includes index and glossary.

Why do I breathe? -- Where does the air go? -- What happens when I breathe in? -- What happens inside my lungs? -- What happens when I breathe out? -- What is an asthma attack? -- How much air can my lungs hold? -- Why do I get out of breath when I run? -- What happens when I cough? -- What happens when I talk? -- How can I breathe without air? -- How can I take care of my lungs? -- All about breathing.