How many pints of blood does an average body hold. I have been told it is 8 universally; but can a 5ft person really have the same as a 7ft giant?

Sophie, Bath UK

• Hang on, when I give blood, I give a pint. So have I given up an eighth of my body fluid?

  John, Leicester

• How many pints of blood does the heart pump every day?

  Loretta Gipson, LA, USA

• Your teacher would have meant 5 litres which is about 8 pints.

  Grace, Durham UK

• I've always been told there was 12 litres of blood in the human body, and I never questioned it.

  Rohit, Bulford, UK