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.
The villus capillaries are branches of the umbilical vessels. Fetal blood comes via the two Aa .umbilicales in the villi and leaves the placenta through a single navel vein, the vena umbilicalis.Their supply amounts to approximately 40% of the fetal heart blood volume per minute.he blood pressure in the arteria umbilicalis amounts to 50 mmHg and the blood flows through finer vessels that cross through the chorionic plate to the capillaries in the villi where the arterial blood pressure falls to 30 mmHg. In the umbilical vein the pressure is 20 mm Hg.