1. During ventricle contraction ( QRS complex ), the heart depolarizes . 2. This influx of sodium depolarizes the formerly polarized cell membrane. 3. In addition, the transporter may contribute to dopamine release when the neuron depolarizes . 4. If this neuron depolarizes the presynaptic axon, it allows the signal to be transmitted. 5. When the MEP depolarizes the muscle fiber releases calcium initiating the process of muscle contraction. 6. It depolarizes at-30mV and helps define the shape of the action potential in cardiac and smooth muscle. 7. Opening of Na + channels allows Na + inflow, which, in turn, further depolarizes the membrane. 8. Even if a current depolarizes a cell, it will inhibit the cell if its reversal potential is below threshold. 9. In mammalian neurons, opening of the ion channels depolarizes the afferent neuron producing an action potential with sufficient depolarization. 10. Latency is decreased with an increased depolarizing current, which overruns the outward ohmic current and more quickly depolarizes the membrane.
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