What are the differences between an mri, mra and mrcp?

See below. These tests are used to look at different structures in the body. Mri can look at soft tissues, brain, spine, joints and others. Mra looks at vessels. Mrcp looks at the bile ducts in the liver and the pancreatic ducts.
What is studied. Mri (magnetic resonance imaging) looks at tissues/organs. Mra (magnetic resonance arteriogram) looks at arteries, for example to evaluate for an aneurysm. Mrcp (magnetic resonance cholangiopancreatography) looks at the biliary system (involving pancreas, gall bladder, liver).