Wahat is the sira
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परिसंचरण तंत्र में, शिरायें वे रक्त वाहिकायें हैं जो रक्त को हृदय की ओर ले जाती हैं।
Ve ract vahikayen jo bina oxygen vaale ract ko dil tak pahuchati hain unhe shira kehte hain