<em>Xenon 133 can be used as a radiopharmaceutical for ventilation scans, images are obtained when the patient rebreathes the gas (wash-in) and then when they exhale (washout),</em> therefore these images can be obtained in just one projection.
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Answer: 1 : knowledge about the natural world that is based on facts learned through experiments and observation. 2 : an area of study that deals with the natural world (as biology or physics)
<span>Normal urine has a specific gravity that is higher than the specific gravity of pure water; dehydration leads to an increase in the specific gravity of urine.</span>
