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Atrium (anatomy) - Definition and Overview |
| Related Words: Amnion, Analysis, Anatomist, Angiography, Angiology, Anthropologist, Anthropology, Anthropometry, Architecture, Arrangement, Assay, Astrobiology, Bacteriology, Biochemistry |
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In anatomy, the atrium (plural: atria) is the blood collection chamber of a heart. It has a thin-walled structure that allows blood to return to the heart. There is at least one atrium in an animal with a closed circulatory system. In fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. In vertebrate groups that evolved later, the circulatory system is much more complicated. Their circulatory systems are divided into two types: a three-chambered heart, with two atria and one ventricle, or a four-chambered heart, with two atria and two ventricles. The atrium's function in the circulatory system includes receiving blood as it returns to the heart to complete a circulating cycle, whereas the ventricle's function is to pump blood out of the heart to start a new cycle.
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Example Usage of (anatomy) |
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miethzz: @Donghae_fishy oppa Hwaiting for your SS2 !!! ^o^/
tomorrow i have ANATOMY Exam. wish me Luck oppa, pray for mE. .
fufuu nervous of exam. |
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SEXYSWAGGA336: @tomuchswaag lmaooo watchin grey anatomy |
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The_Eccles: @iamdaniela lol.nah i wear them all the time,just cant seem to fit a certain bit of anatomy out of the stupid zipper so remove half my pants |
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