Summarizing blood flow: heart, lungs (see below), heart, arteries, capillaries, veins, back to heart. Oxygen travels in arteries. Carbon dioxide travels in veins. Nutrients travel in both veins and arteries. Arteries supply blood to capillaries where oxygen is supplied to cells and carbon dioxide is picked up. Capillaries also allow the nutrients absorbed through the intestinal lining to enter the blood stream. Capillary blood flow is returned to the heart via veins. Pulmonary (heart and lung) blood flow: heart, pulmonary arteries, pulmonary capillaries, pulmonary veins. Note that almost all movement of chemicals from blood to cells and from cells to blood takes place in the tiniest blood vessels: the capillaries.
Now, you must take the packet home, and read it. Use the instructions to create your petition for divorce. Make sure that your petition is properly filled out because once you pay to file the divorce (between $272 and $329), the filing fee is non-refundable with Bexar County. For a good sample of what a common petition for divorce looks like, see this link.
A: This is a complicated question to answer. The Court filing fees are easy... the first paper filing fee in California's superior courts is $395. After that, motions and most other court fees range from $20 - $60 or so. Attorney fees are another matter. On average, we have found that the typical cost for attorney fees for a divorce is between  $15,000 - $20,000 per person.