1 Electromagnetic coil, formed when a conductor is wound around a core or form to create an inductor or electromagnet.  Ignition coil, an electromagnetic induction coil used in internal combustion engines to create a pulse of high voltage for a spark plug.
systemic circulation the general circulation, carrying oxygenated blood from the left ventricle to the body tissues, and returning venous blood to the right atrium. umbilical circulation fetal circulation through the umbilical vessels. vitelline circulation the circulation through the blood vessels of the yolk sac.
umbilical. pertaining to the umbilicus. umbilical cord the structure that connects the fetus and placenta; it is the lifeline of the fetus in the uterus throughout pregnancy. About 2 weeks after conception, the umbilical cord and the placenta are sufficiently developed to begin their functions.