[填空题]Ever noticed how you seem to take longer to get over an illness if you take into 81． your bed for a few days instead of struggling on The reason， according to the leading American health magazine the Prevention， is that a whole range of bodily 82． functions begin to weak after as short a time as one day in bed． Muscle tissue 83． starts to break down，rob the body of important minerals and leading to substantial 84． weakness in just a few days；bones start to break down and lose calciums；the body 85． is able to use food efficiently； heart and blood vessels get weak after a couple 86． of days， which can lead to rise in pulse rate and a drop in blood volume； joint 87． stiffness and constipation are also common． “Prolonged bed rest is not to be 88． taken light，” says Dr Benjamin Natelson， professor of neurosciences at New 89． Jersey Medical School． And that’s why doctors these days make every effort to Getting patients up and moving as soon as possible after heart attacks and 90．