In the axon terminal of the pre-synaptic neuron, what channels open in response to the action potential?
voltage gated calcium channel
What is released from the axon terminal?
neurotransmitters by exocytosis
What area does this substance cross through?
synaptic cleft
What does this substance bind to?
specific receptors on the postsynaptic membrane
What happens as a result of this binding?
opens ion channels resulting in graded potentials
What enters the second neuron?
sodium
What happens to the membrane potential of the second neuron?
depolarizes as it becomes less negative
Name the region of the axon where the action potential begins.
axon hillock
When the membrane potential increases from -70 to -55 mV, the neuron has reached
threshold.
What kind of channels open at -55 mV?
all of the sodium channels
When the channels in question j open, which ions move and where do they go?
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question J: What kind of channels open at -55 mV?
sodium ions enter the cell following its electrochemical gradient
What kind of channels open at +30 mV?
voltage-gated potassium channels
When the channels in question (l) open, which ions move and where do they go?
question I : What kind of channels open at +30 mV?
potassium follows its electrochemical gradient outside of the cell
What kind of channels close at +30 mV?
sodium channels
Which channels are always open?
2 potassium leakage channels and 1 sodium leakage channel
What active transport protein functions in the resting state?
sodium potassium pump transports sodium out and potassium in