superior vena cava: receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins
vena cava: either of two large veins that return oxygen-depleted blood to the right atrium of the heart
titanium: a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite