Match the term with the correct statement in the sliding filament theory.

Actin

protein that has active sites for cross-bridge heads

Cross-bridges

by energizing these structures, chemical energy is converted to mechanical energy

T-tubules

the stimulus to contract the muscle is carried inside the muscle by this structure

Tropomyosin

protein that directly prevents the formation of cross-bridges in the sarcomere

Acetylcholine

chemical released by the motor neuron that initiates the stimulus for a muscle contraction

ATP

compound that supplies the energy for muscle contraction

Calcium

ion that is released by the sarcoplasmic reticulum

Myosin

protein that has cross-bridge heads that pull on the thin fiber

Troponin

protein that has receptor sites for an ion that causes it to change shape and pull another protein away from the receptor sites on the actin