Of the following changes which happen in the renal system in pregnancy, which is FALSE ?

The kidneys become larger, its size increase by 1.5 cm. Dilatation of the renal calyces and ureters can be striking. This is due to progesterone-induced relaxation of the muscularis. An impoant consequence of these physiological changes is an increased risk of upper urinary infection. Pregnancy induced intrarenal vasodilatation--both afferent and efferent resistance decreases--leads to increased effective renal plasma flow and glomerular filtration. Hydroureter- right side>left as pregnant uterus is usually dextrorotated and it compresses right ureter on pelvic brim.