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16 de may. de 2024 · 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.
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Heart is an American rock band formed in 1973 in Seattle, Washington.The band evolved from previous projects led by 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, original members Fisher, Fossen, and Ann Wilson (lead vocals and flute), along with Nancy Wilson (rhythm ...
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26 de ene. de 2024 · What is the heart? The heart is a fist-sized organ that pumps blood throughout your body. It’s your circulatory system’s main organ. Muscle and tissue make up this powerhouse organ. Your heart contains four muscular sections that briefly hold blood before moving it.Electrical impulses make your heart beat, moving blood through these chambers.
Heart Anatomy. Your heart is located between your lungs in the middle of your chest, behind and slightly to the left of your breastbone (sternum). A double-layered membrane called the pericardium surrounds your heart like a sac. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels and is attached by ...
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