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Uteroplacental circulation. The structure of the placenta. Anatomy of pregnancy. Umbilical arteries and vein.
Single lead pacemaker placement. Human body with cross section of hert and artificial cardiac pacemaker. Only one pacing lead is placed into a chamber of the heart, either the atrium or the ventricle. Vector illustration
Vasoconstriction and Vasodilation. Schematic depiction of vessel diameter changes. Normal artery, relaxed vessel wall, and narrowing of the blood vessel for Regulation of Blood Flow. Vascular Response. Vector illustration