Protein that has active sites for cross-bride heads

MATCHING:
a. Troponin
b. myosin
c. actin
d. T-tubules
e. ATP

1. protein that has active sites for cross bridge heads
2. the stimulus to contract the muscle is carried inside the muscle by this structure
3. compound that supplies the energy for muscle contraction
4. protein that has cross-bridge heads that pull on the thin fiber

1.C
2.D
3.E
4.B