Our heart....

 Human Heart

As I said I would tell you more about the heart in this post.....

I have lots to tell you in this....I even made a diagram myself of the heart (please don't see the neatness , I made it while watching T.V).

1. So lets start with, What the heart is and what it does.

• The HEART is the most important organ of the circulatory system. 
• It is a muscular organ located in the centre of the body,between the lungs, slightly tilted to the left.  (some people say the heart is at the left side of the body, I thought so too,but it isn't ,it is centrally located  and tilted towards the left).
• It weighs 200 to 350 grams.
• It pumps blood to all parts of the body. (nothing new,we all knew this since we were probably in the first grade) 

Heart Rate

• The number of times our heart beats (contraction and relaxation of the muscles in our heart) in a minute is called heart rate. (which is normally 80 to 100 times)
• A doctor uses a stethoscope to listen to our heartbeat.

Structure of the heart

• The heart is divided into 4 chambers.Two superior atria and two inferior ventricles. The atria (Plural : Atrium) are the receiving chambers and the ventricles are the discharging chambers.

                                 (it is a reflected image because i took it with my webcam) .

• The atrium has comparatively thinner walls.
• The walls of the ventricles are thicker.
• The right auricle receives carbon dioxide rich blood from various tissues from the body. The auricle then sends the carbon dioxide rich blood to the lungs through the pulmonary artery.
• The left auricle receives oxygen rich blood from the lungs through the pulmonary vein.The left auricle then pumps the blood to the other parts of the body with the help of the aorta.
• The right side of the heart is separated from the left side with the help of the septum,so that the pure and impure blood does not mix.
• The heart has a number of valves that allow the blood to flow in one direction only. 

Working of Heart

                                        (it is a reflected image because i took it with my webcam) 

• From lungs the oxygenated blood is taken to the left atrium through pulmonary vein.
• From the left atrium the oxygenated blood reaches the left ventricle through the valve.
• When the ventricle contracts, the oxygenated blood from the left ventricle passes through the aorta and reaches different parts of the body.
• From the tissues, the carbon dioxide rich bloodis taken to the right atrium,through venacava.
• When the atrium contracts, the carbon dioxide rich blood passes to the right ventricle through the valve.
• When the ventricle contracts , the carbon dioxide rich blood is taken to the lungs by the pulmonary artery.
• The purification of the blood takes place in the lungs and is then taken to the heart through the pulmonary vein.

Science rules!