The five elements alone cannot be converted to life. Life is the combination of these elements with each other. These combinations are called Saptadhatu. Dhatu is originally a Sanskrit word which means ‘that which enters into the formation of the body’; the root Dhaa means ‘support’ or ‘that which bears’. There are seven basic dhatus in the human body, which are composed of the Panchmahabhuta. These dhatus remain inside the human body in a proper equilibrium so that the body can function properly.
Rasa (Plasma) Rasa literally means ‘sap’ or ‘juice’. The primary function of ‘Rasa’ is to strengthen ‘rakta’ (blood) and provide nourishment. Basically, the tissue fluids consist of lymph and blood plasma. Accessory tissues are the breast milk and the menstrual blood.
Rakta (Blood) Rakta Dhatu is said to be constituted from the metabolic refinement of the Rasa Dhatu. The primary function of the Rakta Dhatu is the nourishment of the body. It is also said to be the preserver of life.
Mamsa (Muscles) It is formed from the Rasa and Rakta Dhatu and said to be the basic cover of bone and structure of body.
Meda (Fat) Meda Dhatu are the finer part of the Mamsa Dhatu that are also known as fatty tissue. They keep the lubrication between the various body organs and help the body in maintaining the right internal temperature.
Asthi (Bone) Asthi i.e bones are the finer essence of the Meda Dhatu, which are converted into the most solid form of the Dhatus. They give the basic structure to the body.
Majja (Bone marrow) Majja is the finer essence of the Asthi Dhatu. It is a semi- solid substance, yellow and red in color. Its primary function is filling the bone. It is also found inside the brain and spinal cord.
Shukra (Reproductive fluid or Semen) Sukra is produced from the most refined essence of the Bone Marrow. It is the cause of Ojas, which is actually the essence of all the seven Dhatus. The Shukra is responsible for vitality and energy of the body.