Ayurveda is grounded in a metaphysics of the ‘5 Great Elements’ – earth, water, fire, air and ether – all of which compose the Universe, including the human body. Chyle (called Rasa dhatu), blood (called Rakta dhatu), flesh (called Mamsa dhatu), fat (called Medha dhatu), bone (called Asthi dhatu), marrow (called Majja dhatu), and semen or female reproductive tissue (called Shukla dhatu) are held to be the seven primary constituent elements of the body.