In biology, an adaptation, also called an adaptive trait, is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection. Adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation.
Computed Tomography Angiogram (CT Angiogram). Guide. A computed tomography angiogram (CT angiogram) is a test that uses X-rays to provide detailed pictures of the heart and the blood vessels that go to the heart, lung, brain, kidneys, head, neck, legs, and arms.
An angiogram is done for the following reasons 1  -. It is done to check for problems with blood vessels that can have an impact on the blood flow. 2  It is done to check for changes in the veins or blood vessels of damaged organs. 3  An angiogram can trace the pattern of the flow of blood as also the presence of a tumour.