According to Ayurveda, the basics of human body are-

Dhatus- These are the basic tissues which maintain and nourish the body. They are seven in number namely- rasa(chyle), raktha(blood), mamsa(muscles),meda(fatty tissue), asthi(bone), majja(marrow) and sukla(reprodutive tissue). Proper amount of each dhatu and their balanced function is very important for good health.

Mala- These are the waste materials produced as a result of various metabolic activities in the body. They are mainly urine, feaces, sweat etc. Proper elimination of the malas is equally important for good health. Accumulation of malas causes many diseases in the body.

Srotas- These are different types of channels which are responsible for transportation of food, dhatus, malas and doshas. Proper functioning of srotas is necessary for transporting different materials to the site of their requirement. Blockage of srotas causes many diseases.

Agni- These are different types of enzymes responsible for digestion and transforming one material to another.