The Muscular System
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The Muscular System Part II Skeletal Muscle Contraction
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The Muscular System. Part II Skeletal Muscle Contraction. Introduction. Muscles receive… Actin and myosin… Sarcomeres… Muscle fibers… Pulls on…. Fig. 9.8. Neuromuscular Junction. Each skeletal muscle fiber ___________ connected to a neuron Neurons (Motor Neurons) 1. 2. 3. - PowerPoint PPT Presentation
Transcript of The Muscular System
Neuromuscular Junction
• Each skeletal muscle fiber ___________ connected to a neuron
• Neurons (Motor Neurons)1. 2.3.
• Neurotransmitters1. 2. 3.4.
Excitation Contraction Coupling
• Muscle impulse causes …• Ca2+ binds to …• Binding sites …• Actin can…
The Sliding Filament Theory
• Sarcomeres…• Thin and thick filaments …• Slide past one another
1.
2.
3.
Cross-Bridge Cycling
• Sarcomere shortening1. 2. 3.
• ATP is required 1. 2.
• Cross- bridge binding repeats1. 2.
Relaxation• Nerve impulse…• Acetylcholinesterase
1. 2.
• Calcium …• Myosin…• Tropomyosin … *ATP …
– Rigor mortis