<prompt> Amount of blood in hea250-300 ml500-600 ml1-2 litre100-200 ml  <response>: Out of 5000 mL blood in our body 12 is in the hea cavitiesWhich is nearly 600Therefore generally 500-600 mL BLOOD IN HEARef: Ganongs Review of Medical Physiology Twenty-Third Edition Page No:543 