What is common about all types of bleeding?

The correct response focuses on the potential for infection that is associated with all types of bleeding. When bleeding occurs, especially from open wounds, there is a breach in the skin's protective barrier, which can allow bacteria and other pathogens to enter the body. This makes any kind of bleeding susceptible to infection, necessitating careful management to prevent complications.

In considering the other options, while immediate medical attention can be necessary for severe bleeding, not all bleeding scenarios require it—some minor cases can be treated at home. Bleeding does not always present as bright red; for instance, venous blood can appear darker. Lastly, while bleeding can indeed occur from various injuries, it is not an inherent characteristic of all injuries—certain bruises or non-visible internal damage might not present with external bleeding at all. Thus, the insight regarding infection is universally applicable to all types of bleeding.