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hi hope well thanks for your great support in the previous segments of this blog so in this segment of the blog i would like to talk about respiration respiration in hydra earthworm cockroach fish frog and in birds the mechanism of respiration in them different structure that are involved in it and the pathway of movement of air inside and outside of the body and the thing if you want to know anything related to biology so please let me know down in the comment section and please follow my blog by clicking the follow button below my picture on left side to show your great support so                      lets start  respiration  all of the levels of activities in living organisms an uninterrupted supply of energy is required respiration is one of the most important metabolic activities off all of the organisms by which energy is released and is supplied for the activities of living organisms  levels of respiration  respiration occurs at two levels that are organismic level and the

hi hope well thanks for your great support in the previous segments of this blog so in this segment of the blog i would like to talk about human heart such as its location its protection layers its function its chambers about the circulation of blood the cardiac cycle how heart excites and contracts electrocardiogram artificial pacemaker and the blue babies and the thing if you want to know anything related to biology so please let me know down in the comment section and please follow my blog you can do this on the right side below my picture to show your great support and so                          lets start location such that human is present in the center of his chest cavity between the lungs and is located behind the sternum or the breast bone such that it is protected bu the rib cage and the sternum it is surrounding by a layer known as the pericardium it is said that the size of person heart is equal to that respective person fist its average weight varies from about 250-30