Standalone print servers are a good way to get more mileage out of a printer you already own. They can cost as little as $40 and allow you to use your printer's USB connection. You just plug your printer into the print server, then plug an Ethernet cable between the print server and your network router.
The Vascular System | Back to Top. Two main routes for circulation are the pulmonary (to and from the lungs) and the systemic (to and from the body). Pulmonary arteries carry blood from the heart to the lungs. In the lungs gas exchange occurs.Pulmonary veins carry blood from lungs to heart.losed circulatory systems (evolved in echinoderms and vertebrates) have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. Blood flow is not sluggish.
1 Veins. 2  These are blood vessels that take blood back to the heart; this blood has lower oxygen content and is rich in waste products that are to be excreted or removed from the body.3  Veins become larger and larger as they get closer to the heart.n addition to carrying fresh oxygen from the lungs and nutrients to the body's tissues, it also takes the body's waste products, including carbon dioxide, away from the tissues. This is necessary to sustain life and promote the health of all parts of the body. There are three main types of blood vessels: 1  Arteries.