The blood of the innocent
Bernardo Pérez Andreo. Blood is a symbol of life in every culture, since it is the life-giving liquid that runs through our bodies, and without which the existence of most living beings on our planet would not be possible. Its composition gives it this marvellous ability to transport oxygen to our cells and remove CO2 from them, passing it into our lungs to be expelled. This sanguine interchange occurs because of the chemical composition of iron, which exhibits two valence states, which allows it to take on oxygen and deposit it, thus explaining how blood can transport oxygen, why it has its colour, and why it is always linked with life. (more…)
