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.
If Tax Return Filed Electronically. If Paper Tax Return Filed. At the time their tax return was submitted to the IRS, has no amount owed or has an expected refund. Generally tax returns are accepted by the IRS within a day or two of the return having been electronically filed with the IRS. In most cases, the IRS DRT is available within 2-3 weeks after the return has been accepted by the IRS. Generally tax returns are accepted by the IRS when the tax return is received by the IRS.