As we also know that COVID-19 pandemic was the one of the most dangerious virus in the history. It causes the disease related to respiratory system and it also harm to our immune system which play a principal role in our body to fight against the harmful viruse to keep us healthy and fit .In this situation millions of people lost their life and many more became vagabond and jobless . This was the situation when people were migrating from one country to another or from one state to another to their home . That was the worst situation in the history which I have never faced in my life . There were also many peoples who didn't had much money to return their home safely and even there was also lot of people who did not had much money to purchase food. COVID –19 did not effected the life of human being by economically as well as mentally and physically . All the school ,college and institutions we shut off , all the children who were in the early stage got addicted of mobile phones, laptop and TV. All the activities all over the world was affected. The small children were started spending their time by watching tv, cell phones and by playing video games and online games . Which didn't allowed the mind's of the small children to grow.
C irculation plays an important role in our body ,it circulates oxygen ,blood and minerals to our living cell which is necessary for their growth and development . CIRCULATORY SYSTEM Circulatory system was discovered by William Harvey in 1628. Circulatory system can be either of open type or closed type. In open circulatory system,blood does not flow in vessel. The circulatory system consists of heart and blood vessels. Heart The heart is a hollow fibro muscular organ of somewhat conical aur pyramidal form with upper broad part the base and the lower narrow apex, which is slightly directed to the left . Structure of heart Human heart is situated in the pericardial cavity. The hard wall is made of three layer, ie. Pericardial myocardial and endothelium. Pericardian fluid is the fluid present between layer of heart wall. It allows Frictionless movement...
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