BLOOD

WHAT DOES BLOODY MEAN?
WHAT'S BLOOD?

Bloody means 'Sangriento,maldito, dichoso,etc'. In the UK it's also used as an intensifier of an adjective 'very, as'.
Blood is a bodily fluid in animals that delivers necessary substances like nutrients and oxygen to the cells and transports waste products far from those same cells.

Blood is responsible of the coagulation, transport hormones, regulation of body pH and body temperature, supply of oxygen to tissues, removal of waste, etc.

The average adult has a blood volume of five litres, which is composed of plasma and several kinds of cells (red blood cells,white blood cells and platelets).

I reckon the most important things you can do to have a healthy heart is do exercise, not smoke, not drink too much alcohol and have a balanced diet.