Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life. A labeled heart diagram helps you understand the structure of human heart, which pumps blood through body. Learn the structure and several heart conditions. heart, organ that serves as a pump to circulate the blood. It may be a straight tube, as in spiders and annelid worms, or a somewhat more elaborate structure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks. In fishes the heart is a folded tube, with three or four enlarged areas that correspond to the chambers in the mammalian heart. In animals ... The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels. [1] The heart and blood vessels together make up the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3] In humans, the heart is approximately the size of a closed fist and is ... Your heart is a vital organ that keeps blood pumping through your body. Learn more about your heart. For related background details, please refer to our report on wiring a 1 way switch. Heart is an American rock band formed in 1974 in the Pacific Northwest. [1] The band evolved from previous projects led by the founding members Roger Fisher (guitar) and Steve Fossen (bass guitar), including the Army (1967–1969), Hocus Pocus (1969–1970), and White Heart (1970–1973). By 1975, the original members Fisher, Fossen, and Ann Wilson (lead vocals and flute) along with Nancy ...

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