+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
The _______ in neurons releases neurotransmitters by exocytosis.
|
Axon terminal
|
|
The _______ in neurons has a high abundance of voltage-gated sodium channels and determines whether an action potential will be fired.
|
Axon hillock
|
|
______________send action potentials TO the central nervous system.
|
Afferent neurons
|
|
The resting membrane potential of neurons:
|
All of the above.
|
|
If a neuron becomes permeable to sodium:
|
The neuron would depolarize.
|
|
Graded potentials:
|
Can sum temporally or spatially.
|
|
The opening of which of the following channels would cause an inhibitory graded potential?
|
Ligand gated chloride channel
|
|
The rising or depolarization phase of an action potential is due to:
|
Opening of voltage gated sodium channels.
|
|
The falling or repolarization phase of an action potential is due to:
|
Both (b) and (c).
|
|
The absolute refractory period of an action potential:
|
All of the above.
|
|
During the relative refractory period it is harder to fire another action potential because _________.
|
Voltage gated potassium channels are open and the membrane is hyperpolarized.
|
|
Unmyelinated axons:
|
Have action potentials spread down the axon by contiguous conduction.
|
|
Myelin:
|
Allows for faster salutatory conduction of action potentials.
|
|
Electrical synapses:
|
Are formed when two neurons are connected by gap junctions.
|
|
Order the following events that occur at the synapse from first to last. 1 - calcium triggers exocytosis of neurotransmitter from the presynaptic neuron 2 - neurotransmitter diffuses across the synapse and binds to a receptor on the postsynaptic cell 3 - an action potential reaches the axon terminal of the presynaptic cell 4 - neurotransmitter is removed from the synapse to terminate the response 5 - voltage gated calcium channels open on the axon terminal of the presynaptic cell 6 - the postsynaptic cell responds
|
3,5,1,2,6,4
|
