Images Dated 27th November 2002
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Illustration of the exhalation phase of coughing
Cough. Illustration showing exhalation during coughing. Irritation of the respiratory passages initiates the cough reflex. Nerve impulses pass from the irritated area through the vagus nerves (yellow) to the medulla (brainstem). Here the respiratory centres (coloured red, green & mauve) send nerve signals to the respiratory muscles causing about 2.5 litres of air to be inhaled. The epiglottis & vocal cords close trapping the air in the lungs. The abdominal & internal intercostal muscles then contract forcefully, & the epiglottis & vocal cords suddenly open so that the air is forced out of the lungs under pressure (blue arrows), often carrying foreign matter with it
© JOHN BAVOSI/SCIENCE PHOTO LIBRARY

Motorsport Images

CT scan: brain haemorrhage from cerebral aneurysm
Brain haemorrhage. Coloured computedtomography (CT) scan showing a subarachnoid brainhaemorrhage (green) caused by rupture of acerebral aneurysm. This is a horizontal slicethrough the head. Brain haemorrhages occur whenblood leaks from a damaged blood vessel in thebrain. In this case the cause was a cerebralaneurysm - a berry-shaped swelling in an artery.The pool of blood has collected in thesubarachnoid space - a gap between two of themembranes covering the brain. The condition causessymptoms similar to a stroke: paralysis of eyemovement, rigid neck, headache & unconsciousness.About half those suffering a subarachnoidhaemorrhage are ultimately killed by it
© Gca/Science Photo Library