Stock Photo - Astronaut William F. Readdy measures the veins in his lower right leg on the middeck of the Earth-orbiting Space Shuttle Discovery. The mission specialist uses an electronic monitor and a pair of large blood pressure cuffs that encircle the thigh and calf. Changes in blood volume are determined by inflating the cuffs which then alters the blood pressure. The tone of the veins was monitored before and during the flight and will be measured following the eight-day mission.

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