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Across 1. What part of the myofibril actually gets shorter in length? 4. The presence of calcium on the actin filaments allows the myosin head to ___ to the actin. 7. The crossbridge is broken by the energy in ___. 8. Acetylcholine binds to ___ in the sarcolemma of the muscle cell at the neuromuscular junction. 12. Neurotransmitter that is released by the axon and binds to the sarcolemma of a muscle cell. 13. An action potential in a nerve cell causes the ___ of calcium from the sarcoplasmic reticulum 14. The binding of acetylcholine to the receptors on the sarcolemma of the muscle cell causes these gates to open and this ion to enter the muscle cell.

Down 2. Begins the process of nervous stimulation of a muscle cell 3. The neurotransmitter acetylcholine diffuses across the ___ of the neuromuscular junction. 5. Calcium rushing into the axon of the neuromuscular junction causes this to be released from the axon. 6. When the myosin head attaches the actin, the attachment is called a ___. 9. The sarcoplasmic reticulum stores and release ___. 10. An action potential in an axon of the neuromuscular junction causes this ion to enter the neuron. 11. Once the crossbridge between the myosin head and actin is formed, the myosin head ___, sliding actin past it.