CARDIAC MUSCLE

4. When a cardiac muscle cell contracts, the ________ filament pulls the actin filaments toward each other.
6. It is responsible for keeping the heart pumping and blood circulating around the _______.
7. ________in a single nucleus.
8. Cardiac muscle cells appear striated or striped under a __________.
9. Cardiac cells have only a single _________.
10. This through specialized cells called _______ cells.
11. Cardiac muscle are one of _______ types of muscle tissue.
14. Cardiac muscle cells also contain _________.
16. _________ of cardiac muscle is pumping blood.
18. The heart acts as a ________ to propel blood.
21. Cells joined end-to-end with ________ disk in between.
24. ________ muscle is found in the heart wall.
25. Cardiac muscle fibers also possess many mitochondria and _______.
26. Cardiac muscle tissue, or myocardium, contains cells that expand and contract in __________ to electrical impulses from the nervous system.
27. Pacemaker cells are ________ to other cardiac muscle cells, allowing them to pass along signals.
29. Cardiac muscle ______ striations.

1. Cardiac cells have only a _________ nucleus.
2. Cardiac muscle tissue is one of the three types of _______ tissue.
3. Cardiac muscle also called heart muscle or ________.
5. Exercise can __________ your cardiac muscle.
10. The cell uses ATP to ______ this contraction.
12. cardiac muscle has __________.
13. Also _______ as a myocardium.
15. Pacemaker cells control the ________ of your heart.
17. Cardiac muscle fibers are ________ than skeletal muscle fibers.
19. Involuntary heart ________ also a function of cardiac muscle.
20. The heart acts as a pump to propel blood through the _______ vessels.
22. Your nervous system sends _________ to pacemaker cells that prompt them to either speed up or slow down your heart rate.
23. Its contraction is not under ________ control.
28. Cardiac muscle also one of ______ of muscle tissue.