STRUCTURE AND WORKING OF HUMAN HEART

By Er. Anoop Dhiman11 Comments

STRUCTURE AND WORKING OF HUMAN HEART

Heart is a muscular organ which pumps blood to all parts of the body.

 

STRUCTURE OF HEART

  • Our heart has four chambers. Upper two chambers  are called atria and  the lower two chambers are called ventricles.
  • Since Ventricles pump blood to different organs under high pressure. Therefore , their walls are thicker than atria.
  • The right and left chambers are separated by Septum. It prevent the mixing of oxygenated(pure) and deoxygenated(impure) blood.
  • The atria and ventricles have valves between them to prevent backward flow  of blood.

WORKING OF HUMAN HEART

The working  of heart can be explained in the following  steps.

  1. When all the four chambers are relaxed, the pulmonary vein brings blood from lungs to left  atrium of the heart.
  2. When the left atrium contract, the oxygenated blood pushes into the left ventricle.
  3. When the left ventricle contract, the oxygenated blood pushes from left ventricle to all body organs through main artery.
  4. Now the main vein carry deoxygenated blood from all body organs to the right atrium of the heart.
  5. When right atrium contract, the blood pushes from right atrium to right ventricle.
  6. When right ventricle contract, the deoxygenated blood move from right ventricle to the lungs through pulmonary artery.

In this way blood twice through the heart in on circulation, therefore it is known as double circulation.

 

PLEASE GIVE YOUR VALUABLE REVIEW IN COMMENT BOX

Questions for Self eveluation.....

  1. In how many chamber our heart is divided?
  2. what the other two chambers are called?
  3. what the lower two chamber called?
  4. What is the special name given to the artery which carry deoxigeneted blood.
  5. What is the function of septum.
  6.  What do you understand by double circulation.

HAVE A GOOD DAY.......