Blood contains some dissolved salts, which lower the freezing point.
Blood does not automatically freeze when it leaves the body. It depends on the ambient temperature.
yes
the kidneys clean it by removing the waste from the blood
By veins
a red blood cell is red when it reaches oxegen.
Blood flows through veins after delivering oxygen to the body.
99%
Arteries or arterioles
It travels through the blood to the pancreas.
From the Alveoli, it transfers to red blood cells, which travels through the circulation and reaches the heart.
Death.
Yes. Your donated blood is stored and freeze inside a very cold container. The blood will be transfused to someone whenever he or she needs it.