The Danube connects with the RhineâMainâDanube Canal at Kelheim, with the Donaukanal in Vienna, and with the DanubeâBlack Sea Canal at CernavodÄ. Apart from a couple of secondary navigable branches, the only major navigable rivers linked to the Danube are the Drava, Sava and Tisa.In Serbia, a canal network also connects to the river; the network, known as the DanubeâTisaâDanube Canals, links sections downstream.he Danube (/ËdaenjuËb/ ËDÃ¦NJUËB-dan, ewb also known by other) names Is 'europe s-second longest, river After volga, river and also the longest river in The European union, region located In central And Eastern. europe
The cells that make up the placenta, known as trophoblasts, are able to convert cholesterol from the motherâs bloodstream into progesterone. Between weeks 6-9 of pregnancy, the placenta takes over from the ovariesas the main producer of progesterone.
Placenta abruptio usually occurs in the third trimester. But it can happen at any time after the 20th week of pregnancy. It is also called abruptio placenta or placental abruption.What causes placenta abruptio?Doctors aren't sure what causes it, but some things can raise your risk. These are called risk factors. Common risk