Write briefly the biological importance of Calcium.

Describe briefly the biological importance of calcium and magnesium.

Write briefly the biological importance of the following : (a) Myoglobin , (b) Actin and myosin myofilaments , (c ) Synovial joints, (d) Fibrous joints , (e ) Lactic acid.

Write the biological importance of Na' ions.

Give the biological importance of: Lactic acid.

What are the biological importance of fruits.