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HUMAN BODY -HEART

 

Heart   is  a  hollow  muscular   organ in  the  middle  of the  chest.It  pumps  blood   around   the   body  each  time  it   beats  slowly.Its  weight  is  approximately  300  gram.When   the  human  body  is  at  rest ,the   heart  beats  between   60  and  80  times  a  minute,while  during  exercise or  at  the  time  of stress   or  excitement,  the  rate  may  increase  to  200 beats  a  minute.
 One  side  of  the  heart  receives   blood  from  the  body   and  send it  to   the  lungs  to  collect  oxygen.The  other  side  receive  blood  carrying  oxygen   back  from  the   lungs.  This   is  then  pumped  around  the  body.
 Each   side  is  further  divided   into  two  chambers-an-  upper   atrium  and  a  lower  ventricle.When  the  heart  muscle  contracts,it  squeeze     blood.De oxygenated   blood  enters   the  right  atrium  while  the left   atrium   receive   oxygenated   blood
 FACTS-
 Our  heart  beats  60   to 100   times  a  minute.
 It   pumps  between  70  and  100   ml  of  blood   with   each  beat.
 It  completely   recirculates  the  5-6  liters  of  blood   in  the  body  every 1-1/2   minutes.In   24  hours  the  heart  circulates  up  to  10.000  litres   of  blood.
 It    could  fill   a  petrol   tanker   in  one  day.
 It  will  beat  over 2.5  billion   times  during an  average  life time  of 70  years.
 HEART









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