Across
- 2. basic rod-like unit of a muscle cell also known as muscle fibril
- 4. lack of oxygen in the heart muscle
- 6. contractile protein in heart muscle tissue
- 7. cells joined in a complex network
- 9. contractions generated from muscle itself
- 10. cycle of contractions (systole)and relaxations (diastole)
- 13. blood vessels that bring oxygenated blood to heart muscles
- 16. circulation of blood to and from lungs
- 18. indicates the pressure in arteries when the heart rests between beats. It is the second number recorded, normal figures are 80 or less.
- 19. hormone that regulates heartbeat
Down
- 1. "pacemaker of the heart"; cluster of cells spontaneously initiating action potentials without simulation by other nerves.
- 3. the special junction where end of one cell contacts the another in the complex network of interconnected cells
- 5. the signal from the SA node reaches this place
- 8. tough outer layer of connective tissues surrounding arteries
- 11. maximum arterial pressure during contraction of the left ventricle of the heart.It is the first number recorded when the blood pressure is measured,normal figures are 90-140.
- 12. fatty tissue developed in the artery wall adjacent to the epithelium
- 14. contractile protein in heart muscle tissue
- 15. permits blood to flow only one way from left atrium to left ventricle
- 17. specialized heart muscle through which the signal from the sinostrial node spreads