Giraffe have unusually high heart rates for their size, at 150 beats per minute. When the animal lowers its head the blood rushes down fairly unopposed and a rete mirabile in the upper neck, with its large cross sectional area, prevents excess blood flow to the brain. When it raises again, the blood vessels constrict and direct blood into the brain so the animal does not faint. The jugular veins contain several (most commonly seven) valves to prevent blood flowing back into the head from the inferior vena cava and right atrium while the head is lowered. Conversely, the blood vessels
The Young Veins The Young Veins The Young Veins were a rock band from Echo Park, California. The band was composed of Ryan Ross and Jon Walker, two former members of the Las Vegas band Panic! at the Disco, along with bassist Andy Soukal, drummer Nick Murray and keyboardist Nick White. On July 6, 2009, Ryan Ross and Jon Walker left Panic! at the Disco, citing creative differences as the reason for their departure. Soon afterwards, it was announced that their new project would be a retro-leaning rock band called The Young Veins. Their song "Change" debuted on the duo's Myspace page, and