Across
- 2. this type of circulation carries blood from the heart to all the other parts of the body and back
- 5. this type of circulation is a short loop from the heart to the lungs and back
- 6. These carry blood away from the heart
- 7. the second phase of a heartbeat (heart fills with blood)
- 8. these carry blood to the heart
- 9. The heart sends ________ throughout our bodies, carrying oxygen to every cell
- 12. the sinus node sends out an _____ signal to start contacting the heart muscle
Down
- 1. the first phase of a heartbeat (the lub sound)
- 3. The heart is a ___________.
- 4. Tiny blood vessels that connect very small artery and vein branches
- 8. these is veins keep blood flowing in the correct direction
- 10. Blood travels in only _____ direction only
- 11. the _________ valve separates the left atrium from the left ventricle