Skeletal Muscle Blank

Structure of Skeletal Muscle

Structure of Skeletal Muscle 1 2 3 4 5 6 10 11 9 7 8 12 13 14 15 16 18 17 19 20 21 22

Sarcoplasmic Reticulum

Sarcoplasmic Reticulum

Skeletal Muscle Contraction Cycle

Skeletal Muscle Contraction Cycle 1 2 3 1) 4 2) 5 6 3) 4) 5) 6)

Myosin Actin Tropomyosin Troponin Titin 6. Sarcomere 7. Ca Name: __________________________________ Date: _________________ Create questions using these words as your answers. The questions should identify the role each of these play in skeletal muscle contraction Myosin Actin Tropomyosin Troponin Titin 6. Sarcomere 7. Ca 8. Myosin Head 9. ADP 10. ATP 11. Active Site 12. Rigor mortis 2+

Neuromuscular Junction The axonal ending of a motor neuron and the sarcolemma form a neuromuscular junction. When a nerve impulse reaches the end of an axon, voltage-regulated calcium channels in its membrane open , allowing Ca2+ to flow in from the extracellular fluid into the axonal terminal. The axonal terminal contains vesicles filled with neurotransmitter acetylcholine (Ach), which is released when the Ca2+ is present. Acetylcholine diffuses across the synaptic cleft and attaches to Ach receptors on the sarcolemma, opening Na+ channels and initiating depolarization of the sarcolemma. A. D. B. – C.

Neuromuscular Junction B. – C. D.