Chapter 21: The esophagus, trachea and main bronchi. Thoracic part of esophagus. The esophagus (figs. 21-1, 21-2 and 21-3) has cervical, thoracic, and abdominal parts, extending from the lower end of the pharynx (C6 vertebrae) to the cardiac opening of the stomach (T11 or 12 vertebral level).
Hi, The PSAT is a practice test for the SAT. Colleges do not see your scores, so there is no pressure to do well on it as a sophomore. However, juniors who take the PSAT can qualify for scholarships through the National Merit Scholarship Program if they are in the top 10% of test takers.
Prostate specific antigen (PSA) is a protein produced primarily by cells in the prostate, a small gland that encircles the urethra in males and produces a fluid that makes up part of semen. Most of the PSA that the prostate produces is released into this fluid, but small amounts of it are also released into the bloodstream. This test measures the amount of PSA in the blood. The PSA test is used as a tumor marker to screen for and to monitor prostate cancer.