ANSWER KEY_ Homework #8_Fall 2017 1 1.Acetylcholine-gated channels cation channels do not discriminate among Na+, K+, and Ca2+ions, allowing all to pass through freely. How is it, then, that when acetylcholine receptors in muscle cells open there is a large net influx principally of Na+? (Hint: look at the distribution of ions in the table below).
2.When an action potential in a neuron reaches a synapse, calcium is released into the cell, causing release of neurotransmitter into the synaptic cleft. What causes the release of calcium into the cytosol? Explain your answer