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Back to category: Science Limited version - please login or register to view the entire paper. The Human Heart The human heart is the organ most needed for life.The heart is defined/recoginized as a muscular,pear-shaped organ slightly larger than a clenched fist, which is located in the center of the circulatory system.The heart has the hardest job which is pumping blood throughout the whole human body.It pumps blood at a rate of more than 4 quarts a minute and weigh around 8-12 ounces, this organ beats at a rate of 72 times a minute (on an average).The heart is one of the most amazing organs! The heart is a very strong muscle. It consists of several layers of tough muscular wall, called the myocardium. The outside is covered by a thin tissue called the pericardium and the inside is linded with a layer called the endocardium. The heart is divided in the middle to make the right and the left heart, which in turn are subdivided into 2 chambers. The auricle, is the upper chamber and the ventricl is the lower chamber.The auricles recieve blood for entering the heart; the ventricles ... Posted by: Sean Wilson Limited version - please login or register to view the entire paper. |
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