ROLE OF NaCl -

1. It forms .9% of blood of mammal. It forms .7% of blood of frog.
2. Bicarbonates of Na+ act as buffer for pH constancy.
3. Involved in active transport of glucose, amino acids.
4. Maintains trugidity of R.B.C.
5. As bile salts sodium taurocholate and sodium glycholate) helpful in emulsification (broken of large lipid molecule into small molecules).
6. Maintain isotonicity of tissue fluid. Controls blood pressure.
7. Na+ in nerve impulse. Cl^- is component in gastric juice.
8. Act to prevent dehydration.