Lecture10 - Muscle Physiology II

Lecture10 - Muscle Physiology II - Muscle Physiology II...

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Muscle Physiology II Cross bridge cycling: http://www.sci.sdsu.edu/movies/actin_myosin_gif.html Common Neuronal Elements 1. Soma : central part of neuron, contains nucleus 2. Dendrites : branching cellular extensions, majority of input occurs here 3. Axon : cable like projection, transmits output 4. Axon Terminal : end of an axon, contains synapses a. Synapses : specialized structures where neurotransmitter chemicals are released to communicate with target neurons 5. Myelin Sheath : Protects the neuron and accelerates impulse Action Potentials are a rapid re-distribution of ions along their concentration gradients. The cell membrane of the soma and axon contain voltage gated ion channels - Gating : opening and closing of ion channel pore in response to an electrical or chemical signal - Permeability : each class of ion channel is selective in their permeability to one or more types of ions - For a sodium channel, as sodium is let in, it gives enough potential to open the next gate, thus sending the charge down the path. Motor Units
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Lecture10 - Muscle Physiology II - Muscle Physiology II...

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