Across
- 5. work phase, heart pumps blood
- 7. flow of electricity in the heart originates in the _____ node
- 9. term for heart muscle
- 10. hardening of the arteries, excessive peripheral resistance
- 11. the side of the heart that pumps blood to the lungs
- 14. result of sympathetic innervation, fast heart rate
- 16. blood vessels that allow flow in one direction
- 17. sense blood pressure in the aortic arch and coronary sinus
- 18. relaxation phase, heart fills with blood
- 19. septum that separates R and L sides of the heart
- 20. cardiac chambers that contract from apex to base
Down
- 1. the heart can use _____ for 50% of its total energy during heavy exercise
- 2. cardiac muscle has _____ period to prevent restimulation
- 3. load against which the muscle exerts its contractile force
- 4. innervation that can slow heart rate to almost zero
- 6. innervation that can increase Q by 100%, increase force of contraction
- 8. general vasoconstrictor released at certain sympathetic nerve fibers
- 12. heart is connected by _____ disks that allows chemical and electrical coupling between cells
- 13. thin walled, sac-like chambers that act as primer pumps
- 15. heart has _____ rhythmicity