52.6 MB (4.5 MB compressed)
5239 x 3512 pixels
44.5 x 29.7 cm ⏐ 17.5 x 11.7 in (300dpi)
BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Healthy bladder. Coloured X-ray urogram of a pool of urine collecting in a healthy human bladder, surrounded by the bones of the pelvis. The hip joints can be seen at lower left and lower right. Urine drains into the bladder from the kidneys (not seen), which filter waste products out of the bloodstream continuously. The size of the bladder varies from person to person, but on average it can hold up to half a litre of fluid before the urge to urinate becomes painful. Urograms are made by injecting the body with a substance that is opaque to X-rays, and then taking an X-ray after the kidneys have had enough time to remove this substance from the blood.
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