Cardiac muscle

4. resting membrane potential in cardiac muscle
7. what ion is responsible for the plateau in cardiac muscle AP?
11. primary ion responsible for AP in a pacemaker cell
12. location of pacemaker
13. muscular wall of the heart
15. ______ cells: capable of forming action potentials
16. T/F Ca+ binds to Troponin in cardiac excitation-contraction coupling.
17. the duration of the action potential is the _____ as the duration of its contraction.
18. T/F Cardiac muscles can have tetanization?
19. covers the outer surface of the heart; aka visceral pericardium
20. normal pacemaker of the heart

1. _____ channels participate in spontaneous depolarization of the pacemaker
2. mitochondria make up __% of cytoplasm volume in cardiac fibers
3. ________ cells: contracting heart cells; striated; conduct impulse; atrial and ventricular muscle
5. compartment in the thoracic cavity that holds the heart
6. pacemaker Na channels; close during AP
8. serous membrane forms the outer wall of the heart cavity sac
9. covers the inner surface of the heart
10. the myocardium is interconnected by _________ which allow AP to travel easily
14. ________ cells: conduct action potentials through the heart; create excitatory system that controls rhythmical beating
17. Atrial cells have ______ action potentials than ventricular cells.