Q:
      
      
         
            
The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: C) T wave         
         
Explanation: The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.
       
      
      
      
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