Hlw reader,
Here is some interesting biological fact about the human heart,
So to know about that read complete post.......

        Heart           



  • Heart is a pumping organ consist of cardiac muscles,soft and spongy organ...
  • Heart is fist in shape located in thoracic cavity b/w lungs
  • Size....

      11 cm long
       9 cm wide
       3 cm thick
  • Weight...
      300 gm in male
      250 gm in female

               


  •  Heart i protected by a membrane called pericardial membrane.
  •  Heart produce 'lubb-dup' sound.
      Heart is layered by 3 membrane
       i.e., 1st-pariental membrane
              2nd-pericardial membrane
              3rd-visceral membrane

  •  Internally human heart consist of         4 chambers....
              1.Right auricle
              2.Left auricle 
              3.Right ventricle 
              4.Left ventricle
Note---
Fish has 2 chamberd heart
Amphibia has 3 chamberd hearr
Reltiles has 3 chambered heart
Crocodile has 4 heart

  • The upper part of heart is auricle while lower part is ventricle
  • Right auricle and right ventricle separated by bicuspid valve whereas left auticle and left ventricle separated by bicuspid valve or miteral valve
  • 0.8 second takrn by heart for one cardiac cycle.
  • 70-72 times heart beats per minute.
  • It has a (pacemaker)-it is a buttom like muscular tissue which generate electric impule itself and regulate the function of heart.
  •  
Labelled diagram of heart...... 
         
      Now, u  knew about the heart
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