Which system does NOT actively circulate fluids throughout the body?

The endocrine system is primarily responsible for the production and secretion of hormones that regulate various bodily functions, such as metabolism, growth, and mood. It does not have a mechanism for actively circulating fluids throughout the body in the same way that the cardiovascular system distributes blood or the lymphatic system transports lymphatic fluids.

The cardiovascular system pumps blood through a network of vessels to deliver oxygen and nutrients to tissues while removing waste products. The respiratory system is involved in the exchange of gases, where inhalation and exhalation facilitate the movement of air, and the lymphatic system helps transport lymph, which is crucial for immune responses and fluid homeostasis. In contrast, the endocrine system releases hormones into the bloodstream, but it does not have a circulatory mechanism of its own for fluid transport. Therefore, it does not actively circulate fluids like the other systems mentioned.