• Rasa (Chyle including lymph) 
• Rakta (Blood) 
• Mamsa (Muscle)
• Meda (Fat tissues) 
• Asthi (Bone)
• Majja (Marrow)
• Shukra (Semen)

These seven dhatus are composed of five mahabhutas. These dhatus remain inside the human body in a proper equilibrium and any disturbance in their equilibrium causes disease.
 

• The word 'Dhatu' is derived from the verb 'Dhru', which means to support.
• In Ayurveda, dhatu means to support and nourish.
• Dhatus are the basic nutritional and structural factors of the body.
• They promote the growth and support the mind.
• The cell is the structural unit of all the tissues except the rasa (lymph). 
• The life starts as single cell, fertilized ovum, which contains representatives of all tissues, doshas and malas. 
• Tissues grow by multiplication of cells and corresponding increase in interstitial tissues.
• Tissues constitute the basic structural units of the body.
• Organs are composed of highly specialized cells e.g. liver, lungs, pancreas, etc.
• Vata, pitta and kapha molecules constitute the structural as well as functional units of all the cells as well as the body.
• Rasa, the primary tissue, is derived from food and is composed of vata, pitta and kapha molecules. It supplies nourishment to all the tissues. It does not contain cells.