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Title: What are the steps leading to a calcium ion entering a muscle cell? Post by: smileylady6770 on May 9, 2013 I have to use the words Action Potential, Acetylcholine, Synapse, Neurotransmitter, sarcolemma, depolarization, SR, vesicle, T-Tubules, and receptors. I have a severe concussion and miss too much school to under stand this and i have a big final coming up tomorrow . Someone please help me !
Title: What are the steps leading to a calcium ion entering a muscle cell? Post by: leenamu on May 9, 2013 Myosin is involved. Actin might too.
Title: What are the steps leading to a calcium ion entering a muscle cell? Post by: darksith77 on May 9, 2013 See this image: http://legacy.owensboro.kctcs.edu/gcaplan/anat/images/Image331.gif
1. A depolarization in the motor neuron starts an action potential which travels along the axon to the pre-synaptic terminal of the neuromuscular synapse. 2. The action potential causes acetylcholine filled vesicles to bond the membrane and release the Ach into the synaptic cleft. 3. The Ach diffuse and bind to receptors on the sarcolemma of the muscle cell. 4. The binding of the Ach to the receptors causes Na+ to enter the muscle cell and starts an action potential within the muscle cell. 5. The action potential travels to the SR causing it to release Ca++ ions into the cell. |