What is the consequence of extreme blood loss in an animal?

Extreme blood loss in an animal leads to a decrease in blood pressure. This occurs because blood volume decreases significantly, which compromises the circulatory system's ability to maintain adequate pressure within the blood vessels. When blood pressure drops, the organs and tissues may receive insufficient oxygen and nutrients, potentially leading to shock and multi-organ failure if not addressed quickly.

The other choices do not accurately reflect the consequences of severe blood loss. For instance, extreme blood loss would not result in an increased energy level or improved muscle function, as the body would be struggling to maintain basic functions due to reduced oxygen delivery. Additionally, the metabolic rate would likely decrease rather than enhance, as the body prioritizes survival over energy expenditure during such a critical state.