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SEC1 SUMMARIZATION (Synapse (A small gap exists between the axon one…
SEC1 SUMMARIZATION
Synapse
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When a motor neuron synapses with a muscle cell, the released neurotransmitter crosses the synapse and causes a muscle to contract.
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potential
resting
When a neuron is at rest, it is not conducting an impulse. Notice that there are more sodium ions (Na+) outside the cell than inside the cell. The reverse is true for potassium ions (K+)—there are more potassium ions inside the cell than outside the cell.
action
When a stimulus reaches the threshold, channels in the plasma membrane open.
Sodium ions rapidly move into the cytoplasm of the neuron through these channels, causing a temporary reversal in electrical charges.
The inside of the cell then has a positive charge, which causes other channels to open.
Potassium ions leave the cell through these chan- nels, restoring a positive charge outside the cell.
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types of nuerons
neurotrasmitter
carry impulses to motor nuerons, and found in spinal cord and brain
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