What effect does dehydration have on blood volume?

Dehydration leads to a decrease in the total amount of fluids in the body, which in turn reduces blood volume. When the body loses water through various means, such as excessive sweating, inadequate fluid intake, or illness, the plasma component of blood becomes diluted. This reduction in plasma volume directly impacts overall blood volume, making it less than normal. As a result, the heart has less volume to pump, which can affect circulation and oxygen delivery to tissues. Maintaining adequate hydration is essential for preserving normal blood volume and ensuring effective cardiovascular function.