Heart
Heart is the organ present in all well developed organism .In human it is the main organ present under chest at left side .It is made up of muscles .The weight of heart is approximately 310 gram .The main function of heart is to purify the blood .The heart purify the deoxygenated blood into oxygenated blood .It work like pump as it constantly purify the blood without any break .The size of human heart is similar to fist of human . Heart holds four chambers i.e upper two is atria (right atrium , left atrium )and lower two is ventricle (right ventricle , left ventricle)
Working of human heart :
1.) The human heart is divided into four chambers and the blood circulation takes place in this chambers to purify the blood.
2.) The deoxygenated blood from all parts of body enters in right atrium through venacava .
3.) Then from right atrium it pass on in right ventricle then through pulmonary artery it goes into lungs.
4.) The lungs purify the blood by taking carbon dioxide from it and adding oxygen in it .
5.) The blood through pulmonary vein comes back into heart in left atrium .
6.) Then the oxygenated blood goes into left ventricle and from left ventricle it circulate all over body through blood vessels .
7.) In this way the circulation of blood remain continue and the pumping of heart is constantly provide oxygenated blood to all parts of body.
- Question based on topic :
1) What is Heart ?
2) Explain the working of human heart ?
3) What is the weight of heart ?
4) What is the size of heart ?
5) How many chamber did human heart have ? Which are they ?