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Across 2. When a muscle is stimulated by two identical stimuli, the second causes a _________ contraction 3. After acetylcholine binds with receptors on the sarcolemma, it stimulates _______ to enter the muscle cell 4. Area of close contact between a nerve and muscle 7. Muscle _______ is a single, brief stimulus, which causes a muscle to quickly contract and then relax 8. Type of nerve which stimulates skeletal muscle 10. __________ muscle responses are long, smooth contractions which vary in strength 11. Term used to describe the constant, slight state of contraction used to keep muscles healthy and stabilize joints 12. When muscle tension increases in a manner that looks like a set of stairs 13. A rise in intracellular _________ concentration stimulates a muscle contraction 14. Spaces within the axon terminal filled with neurotransmitters 17. The force of a contraction is varied by stimulating a different number of ______ ______. 18. Portion of the muscle cell on the other side of the synaptic cleft from the axon 20. The continual, smooth contraction of a muscle

Down 1. Myofilament which actually slides during muscle contraction 2. Space between the axon terminal and muscle fiber 5. Section of the sarcomere which becomes smaller during muscle contraction 6. A ____________ junction is formed when a axon terminal connects to a muscle fiber 9. Neurotransmitter used to carry an action potential across a synapsis 15. ______________ is caused when the muscle can't generate enough ATP to continue contracting 16. Larger motor units are stimulated for ______ movements 19. Smaller motor units are stimulated for _____ movements