Uterus during pregnancy, 19th century illustration
Illustration of the uterus (womb) during pregnancy. During pregnancy the diameter of the blood vessels increases to allow for increased blood flow to the foetus via the placenta. From An Improved System of Midwifery, by Wooster Beach (1794-1868), published in 1851., Photo by NATIONAL LIBRARY OF MEDICINE/SCIENCE PHOTO LIBRARY
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