I am not an expert in blood but the reason why blood coagulates when dehyadred is because it dries up faster like a plants leaes when you don't water it.
What is meant by blood thickness? Do you mean blood clotting faster or slower as in necessary to prevent strokes and heart attacks? People take medicine to "thin" the blood which really only means that the blood does not form clots as easily. Or as in too much blood? The amount of red cells compared to just the liquid part of blood changes due to many different conditions. People with "thick" blood may have too much iron, may have emphasema, may have had their spleen removed, may be dehydrated. Does this help?
They have a heart. Pretty much like ours, but smaller and faster.
this happens because the heat of the human blood temperature will be attracted easier in warm water. But if they smell blood faster won't they swin faster in warmer water? No because cold water is much more of an ocean temperature water so sharks swim faster in cold water.
If a blood vessel ruptures, it has developed a leak. In an artery (going away from the heart) the blood will leak much faster than in a vein (going back to the heart).
No that is something that you need to leave to a professional. Take them to their primary care doctor for blood testing. It will be both faster and much safer.
drinking so much that you become dehydrated.
Not a lot because they can get dehydrated and die.
i guess injections since it gets into the blood stream much faster
If a blood vessel ruptures, it has developed a leak. In an artery (going away from the heart) the blood will leak much faster than in a vein (going back to the heart).
Well, the faster your blood flows, the more you will bleed while getting the tatoo. And a way to prevent your blood from flowing faster is to be calm and relaxed while you're getting the tatoo. Avoid doing physical exercises just before you go get your tatoo.
much much much faster
An artery in the body is like the highway where veins are the main street's. In an artery there is much more volume of blood being moved at a faster speed. It carries more blood because it is bigger then a vein. If you cut a vein the volume of blood loss would be less because of the size limiting the flow. If the femoral artery was cut the blood loss would come out much faster and be much more serious. You could expel all of your blood in a matter of minutes before a life squad could get to the scene.