Answered by The Community. Making the world better, one answer at a time. Auricles are the two upper chambers of the heart divided into right auricle and left auricle.Right auricle always contains deoxygenetated blood (blood mixed with carbon dioxide) and left one has the oxygenetated blood.he two types of the blood do not get mixed up as the two auricles are separated from one another by an interauricular septum.
False negative results (test is negative, but you are actually pregnant) usually occur if the blood pregnancy test was performed too early (a rule of thumb is that it takes at least 7 days after conception for the test to show a positive result).
A pregnancy test will detect this hormone about one week after fertilization. Most women tend to wait to take a pregnancy test until after they have missed one menstrual period. If you take a pregnancy test one week after you were supposed to get your period, the result will be about 95% accurate. If you take it too soon after fertilization, it may show up negative when in fact you really are pregnant. Pregnancy test are meant to be considered screening tests. If your test comes up negative, but you are experiencing symptoms of pregnancy you should call your doctor.