Across
- 3. large diameter vessels formed by the merging of venules
- 5. The amount of blood remaining in the chamber at the end of systole
- 7. aortic or pulmonary valve
- 9. returns blood from head, upper limbs to atrium
- 12. amount of valves in the heart
- 13. receives oxygen rich blood from left atrium
- 16. specialized cardiac muscle cells capable of pacemaker activity
- 17. A stiff narrow valve that does not open completely
- 18. represents atrial depolarization
- 20. neurotransmitter that causes heart rate to decrease
- 21. the smallest diameter vessels that are formed when arterioles branch
- 23. H.R x S.V
- 25. cardiac cycle that consisting of contraction and emptying
Down
- 1. composed of large vessels that carry blood from the heart
- 2. cardiac cycle consisting of relaxation and filling
- 4. the vessels that form when capillaries join together
- 6. At constant volume
- 8. receives oxygen poor blood from right atrium
- 10. ensure a one way flow of blood
- 11. returns blood to atrium from trunk, legs
- 14. neurotransmitter that causes heart rate to increase
- 15. cells that initiate and conducts the action potentials that promote muscle contraction
- 19. right av valve
- 22. left av valve
- 24. represents ventricular repolarization