Cognitive Neuroscience Final Exam

Cognitive Neuroscience Final Exam Interneurons Connect spinal motor and sensory neurons The Action Potential: Step 1 - Threshold Triggering event depolarizes cell body. If the cell body gets positive enough to reach threshold of -55mV, the sodium channels will open. The Action Potential: Step 2 - Depolarization The sodium channels activate and the positively charged sodium ions flow into the negatively charged axon The Action Potential: Step 3 - Repolarization Brings the cell back to resting potential. The sodium channels close and the potassium channels open The Action Potential: Step 4 - Hyperpolarization Makes the cell more negative than its typical resting membrane Synaptic Transmission When action potential reaches the axon terminals... 1. Calcium channels to open 2. Triggers the vesicles to bind to the presynaptic membrane 3. A neurotransmitter is released into the synaptic cleft 4. Binding of the neurotransmitter to the receptor of the postsynaptic membra