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HUMAN HEART  HEART :                 Heart is a muscular organ which pumps the blood through out the body with the help of circulatory system. Information :  The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. The heart is a muscular organ about the size of a closed fist that functions as the body’s circulatory pump. It takes in deoxygenated blood through the veins and delivers it to the lungs for oxygenation before pumping it into the various arteries which provide oxygen and nutrients to body tissues by transporting the blood throughout the body.  The heart is located in the thoracic cavity medial to the lungs and posterior to the sternum. The circulatory system is composed of heart and blood vessels including arteries, veins, and capillaries. The heart is the key organ in the circulatory system. As a muscular organ, its main functi

ENZYMES : Enzyme , a substance that acts as a catalyst  in living organisms, regulating the rate at which biochemical  reactions  proceed without itself being altered in the process.   CLASSIFICATION OF ENZYMES:  A) On the basis of site of action:   i) Exoenzymes / Extracellular enzymes:  These type of enzyme which are Secret outside the cell .                                           E.g..: proteoses, lipases.   ii) Endoenzymes / Intracellular enzymes: These type of enzyme which are present inside the cell .                E.g..: synthetases, phosphorylases.  iii) Constitutive Enzymes:  These type of enzyme which are produced in absence of substrate.      Eg.: Enzymes of glycolytic series.  iv) Induced Enzymes:                        These type of enzyme which are produced in presence of substrate.     Eg.: hepatic microsomal enzymes.  v) Zymogens / Proenzymes:                These type of enzyme which are produced naturally in an inactive form which can