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ADH (antidiuretic hormone) is a hormone that targets the kidney. It triggers the insertion of aquaporins into the walls of the collecting duct.

When the water concentration in the body is too low (...

Enzymes are biological catalysts. This means they spead up chemical reactions in the body. To understand why they might stop working, you must first look at the structure. Enzymes are proteins made up of ...

For a reaction to occur between particles (reactants) they must overcome an energy barrier. This is called the activation energy. A catalyst provides an alternative pathway for the reaction, that has a lo...

180-140=40 

40/2 =20

each other angle is 20 degrees