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base of heart

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n.

The part of the heart formed mainly by the left atrium and to a lesser extent by the posterior part of the right atrium, directed backward and to the right, and separated from the vertebral column by the esophagus and aorta.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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