CARDIAC MUSCLE

2. Involuntary heart ________ also a function of cardiac muscle.
5. Cardiac muscle cells appear striated or striped under a __________.
7. Cardiac muscle tissue is one of the three types of _______ tissue.
10. Cardiac muscle cells also contain _________.
11. Its contraction is not under ________ control.
13. ________ muscle is found in the heart wall.
14. Cells joined end-to-end with ________ disk in between.
15. When a cardiac muscle cell contracts, the ________ filament pulls the actin filaments toward each other.
16. The heart acts as a pump to propel blood through the _______ vessels.
17. Cardiac muscle tissue, or myocardium, contains cells that expand and contract in __________ to electrical impulses from the nervous system.
19. Cardiac cells have only a single _________.
21. Your nervous system sends _________ to pacemaker cells that prompt them to either speed up or slow down your heart rate.
23. It is responsible for keeping the heart pumping and blood circulating around the _______.
24. The cell uses ATP to ______ this contraction.

1. Pacemaker cells are ________ to other cardiac muscle cells, allowing them to pass along signals.
3. Cardiac muscle also called heart muscle or ________.
4. Pacemaker cells control the ________ of your heart.
6. Exercise can __________ your cardiac muscle.
8. cardiac muscle has __________.
9. _________ of cardiac muscle is pumping blood.
10. Cardiac muscle fibers also possess many mitochondria and _______.
12. This through specialized cells called _______ cells.
18. Cardiac cells have only a _________ nucleus.
20. Cardiac muscle fibers are ________ than skeletal muscle fibers.
22. The heart acts as a ________ to propel blood.