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 Blood Book the Roush. Ba'al compiles their accounts into his journal, known as a blood book. He also includes stolen journal entries from his enemy Thomas Hunter and his master, the Shataiki queen Marsuuv. It contains sketches of various creatures and locations featured in Other Earth. A certain Blood Book, though not Ba'al's, as there were more than one, also plays a significant role in the plot of "Immanuel's Veins", as the main character Toma Nicolescu uses the information contained within to defeat the villainous Vlad van Valerick. It appears that the concept of Ba'al's Blood Book was adapted after the release