Lymph : It is described as filtered blood plasma having lower protein content. It is clear, watery fluid, that flows through lymphatic vessels, It is a link between blood and tissue fluid. It contains :

(i) fluid plasma with low protein content and

(ii) lymphocytes that squeeze out of capillary walls.

Functions of lymph :

(i) It helps in the distribution of nutrients, hormones  etc .

(ii) Fats are absorbed through the lymph in the lacteal present in the intestinal villi. 

(iii)  It helps in providing immunity.

(iv) It controls concentration of proteins in the tissue fluid.