The circulatory system is the organ system that circulates blood and nutrients through the body.
The circulatory system of Jem'Hadar soldiers begins to shut down without ketracel-white. (DS9: "The Abandoned", "Hippocratic Oath", "To the Death")
The Breen have no liquid circulatory system. (DS9: "In Purgatory's Shadow")
A Borg drone's cardiopulmonary system is reinforced. (VOY: "The Haunting of Deck Twelve")
In 2367, after brainwashing by the Romulans, Geordi La Forge suffered from insomnia which was caused by a minor vascular irregularity in the visual cortex, a slight dilation of the blood vessels. (TNG: "The Mind's Eye")
Referenced parts of the system