The Motor Unit and Skeletal Muscle Contraction 4.0 / 5 based on 1 rating ? Physical EducationAnatomy & physiologyASOCR Created by: [email protected]Created on: 27-03-17 17:53 10279345816 Across 1. Depending on whether the stimulus is above a threshold, all muscle fibres will give a complete contraction or no contraction at all (3, 2, 4, 3) 6. ........ ......... are specialised cells which transmit nerve impulses rapidly to a group of muscle fibres (5, 7) 9. The ..... ...... is a motor neuron and the muscle fibres stimulated by its axon (5, 4) Down 2. Sending the nerve impulse to the muscle fibres is an electrochemical process which relies on a nerve ...... ......... to conduct the nerve impulse as a wave of electrical charge down the axon to the motor end plates (6, 9) 3. A ......... .......... can only contract when stimulated by an electrical impulse sent from the central nervous system (8, 6) 4. An action potential cannot cross the synaptic cleft without a ................. (16) 5. There is a small gap between the motor end plated and muscle fibre called the .......... ........ (8, 5) 7. If the electrical charge is above a ............ the muscle fibre will contract (9) 8. The ...... ...... functions to carry nerve impulses from the brain and spinal cord to the muscle fibres, initiating muscular contraction (5, 4) 10. Neurotransmitter called ............. is secreted into the synaptic cleft to conduct the nerve impulse across the gap (13)
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