Minor chest injury. You may have chest wall pain after a less serious injury. This pain can occur with movement of a shoulder, an arm, the rib cage, or the trunk of the body. Even a minor injury can cause chest pain for days after the injury.
Quick Answer. A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood. Continue Reading.
Blood has four components: plasma, red blood cells, white blood cells and platelets. Plasma is the liquid component of blood, in which the other three components are suspended. Red blood cells comprise about 40 percent of the blood's volume, while plasma makes up more than half of the volume.