Hypovolemic Shock occurs when:

Hypovolemic shock specifically relates to a significant loss of blood volume, which can occur due to various reasons, such as hemorrhage or dehydration. When the body loses large amounts of body fluids, it compromises the circulatory system's ability to maintain adequate blood pressure and perfusion to organs and tissues. This loss of volume leads to decreased oxygen delivery and can result in vital organ failure if not addressed promptly.

The other options describe different types of shock or medical conditions. For example, when the heart fails to pump blood effectively, it typically indicates cardiogenic shock. Spinal cord damage may lead to neurogenic shock due to loss of vascular tone, while a severe infection would result in septic shock. Understanding the distinct causes of hypovolemic shock is crucial for effective assessment and management in emergency medical scenarios.