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Across 3. Covers exchange surfaces; Difficult barrier to penetrate 5. Thin-walled, elastic, stretches as it collects blood. 6. A change in one of two variables is reflected by a change in another. 10. A measure of the probability that damage to health will occur, as a result of a given hazard. 12. The biggest killer in the UK. 13. Lining of airways become inflamed; More than normal mucus secreted; Bronchiole muscles contract 14. Thicker, muscular wall as it must pump blood much further.

Down 1. "The ---- that causes cholera enters the body..." 2. Scars form on the epithelium of the lungs. 4. Causes cells to mutate and leads to rapid, uncontrolled growth. 7. Elastin is permanently stretched; No longer able to force out all the air from alveoli 8. This graph shows that the majority of the population is in the middle of the data, with small extremes. 9. Gains entry to host; Colonises host tissue; Resists defences of the host; Causes damage to host tissue 11. Produced by bacteria that leads to damage of host cells