The walls of the left atrium are slightly thicker than the walls of the right atrium. Oxygen-rich blood from the lungs enters the left atrium through the pulmonary vein. The blood is then pumped into the left ventricle chamber of the heart through the mitral valve.From there, the blood is ready to be pumped into the body to deliver oxygen-rich blood to all bodily tissues.he blood is then pumped into the left ventricle chamber of the heart through the mitral valve. From there, the blood is ready to be pumped into the body to deliver oxygen-rich blood to all bodily tissues.
The IRS will begin accepting 2016 tax returns on Jan. 23, and this yearâs deadline is April 18 â not 15 â because the deadline arrives on a weekend and is followed by the Emancipation Day holiday in Washington.
You might learn that the IRS has accepted your income tax return within days of filing or after a few weeks, depending on how you file. The Internal Revenue Service can accept your tax return within 72 hours of e-filing or within three weeks for a paper return.You will receive an email notification that your return has been received within 24 hours of your electronic submission.The Where's My Refund tool on the IRS website allows you to check the status of your tax refund, including the date that it was accepted.ou might learn that the IRS has accepted your income tax return within days of filing or after a few weeks, depending on how you file. The Internal Revenue Service can accept your tax return within 72 hours of e-filing or within three weeks for a paper return.