"The Cycle" of the Cardiovascular System: 1. is sent throughout the body with every heartbeat. 2. begins to circulate when the heart relaxes between two heartbeats. The blood then releases 3. and 4. to the cells and takes on 5. and other waste. The 6. blood returns to the heart after transporting nutrients and oxygen. The 7. pumps blood back to the 8. to pick up more 9., then the cycle repeats. I don't know what goes in the blanks!