A growth on the skin caused by a viral infection.
A sign that a person may be having breathing problems. Sufferers of Asthma often wheeze. It is a whistling sound that comes from a narrow airway.
White blood cells
Blood cells that fight infections. The three types of white blood cell are; granulocytes, monocytes and lymphocytes. Each has a different role in fighting infection.
This is the tube that carries air to the lungs. It starts just below the voicebox in the neck and carries on inside the ribcage until it gets to the bottom of the breastbone. It then divides into two bronchi.
A crease in the skin. They are often caused by sunlight exposure and a degeneration of the elasticity of the skin.