Muscle Cell Contraction

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Skeletal Muscle Activity: Contraction

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Presentation transcript:

Muscle Cell Contraction Prezi: Neurotransmitter released into synaptic cleft “Function of neuromuscular junction” saladin ch 11 “Action Potential and Muscle Cell” ch 11 saladin

Contraction: How to stimulate the cell Stimulus – Action potential Axon terminal to neuromuscular junction Ca++ into neuron Acetylcholine (ACh) released into synaptic cleft 5. Na+ into muscle cell – depolarization 6. Action potential on muscle cell 7. Following A.P. K+ leaves - repolarization

Depolarization/Repolarization???? Na+ through sarcolemma– depolarization Action potential K+ leaves – repolarization… video

Contraction: How muscle cell shortens 8. Action potential 9. SR releases Ca++ 10. Ca++ attaches to actin 11. Binding sites open for myosin heads 12. SLIDING FILAMENT THEORY

SLIDING FILAMENT THEORY Contraction: How muscle cell shortens microscopically SLIDING FILAMENT THEORY

Relaxation: Need to get myosin heads to detach Stimulus stops Acetylcholinesterase (AChE) Stop A.P. Ca++ reabsorbed Heads detach Na+/K+ pump

Post Muscle Contraction This simple process occurs in just a few thousandths of a second!!! Summary New Summary:McGraw Hill PROJECT TIME!!! Student Example Beth Dietzen: Prezi Sam B photostory