"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!