1. Is the blood in your veins blue? Deoxygenated blood found in your veins is NOT blue. It is a myth that your blood turns blue when it comes in contact with oxygen. The blood (oxygenated) located in your arteries is bright in color, and blood (deoxygenated) found in your veins is dark red in color. The pigment of the veins gives these vessels a bluish appearance. back to questions

2.Why doesn't blood usually clot in your blood vessels? Clotting normally doesn't occur because the lining of your vessels is smooth and anticoagulants in the blood inhibit platelets to form clots. back to questions

3. What was the name of the bacteria that was responsible for the death of approximately 25 million people in late 1320's? Yersinia Pestis was responsible for the Bubonic Plague. back to questions

4. How did the bubonic plague get its name & why was it nicknamed black death? Bubonic Plague caused symptoms such as the swelling of the lymph nodes which mainly occured in the neck, groin, and underarm. The swollen lymph nodes are known as buboes, which is where the bubonic plague got its name. The skin on all plague victims appears to be a ghastly purple color from dried blood under the skin. This blood eventually turned black which is where the bubonic plague was nicknamed black death. back to questions