Why is oxygen needed for respiration, and why would training to relax extend yourability to hold your breath?

answer; polycythemia is the correct answer;

creative diagnostics provides a protocol for total protein extraction based on ripa which is widely used.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.