MRI vs. MRA. An MRA, or magnetic resonance angiogram, is a type of MRI scan that uses MRI's magnetic fields and radio waves to produce pictures of blood vessels inside the body, allowing doctors to locate problems that may cause reduced blood flow.
Best Answer: Ethyl alcohol, at the concentrations used in most antibacterial preparations, kills bacteria by disrupting membranes and by denaturing proteins. Ethylalcohol is miscible in water (that is, completely soluble). But ethyl alcohol can also dissolve in the membranes of cells.
The primary issue is that the alcohol we drink is ethanol. Rubbing alcohol is isopropyl alcohol. Isopropyl alcohol isn't as toxic as some other industrial alcohols, like methanol or ethylene glycol, so it's of limited safety for consumption. But it's more toxic than ethanol, so for safety a bittering agent is added to make it unpalatable.