Admin What happens when an action potential reaches the terminal of the axon quizlet?
When an action potential reaches the axon terminal: neurotransmitter molecules are released from the axon terminal and bind to receptors on the postsynaptic neuron, causing either an inhibitory hyperpolarization or an excitatory depolarization.
What happens immediately after an action potential arrives at the axon terminal of a motor neuron?
When an action potential, or nerve impulse, arrives at the axon terminal, it activates voltage-gated calcium channels in the cell membrane. Calcium ion influx triggers synaptic vesicles to release neurotransmitter. 4. Neurotransmitter binds to receptors on target cell (in this case, causing positive ions to flow in).
What happens when the action potential reaches the axon terminal and synaptic end bulbs?
When an action potential reaches the axon terminals, voltage-gated Ca2+ channels in the membrane of the synaptic end bulb open. The concentration of Ca2+ increases inside the end bulb, and the Ca2+ ion associates with proteins in the outer surface of neurotransmitter vesicles.
When an action potential reaches the end of an axon an electrical impulse is then converted into a quizlet?
when action potentials reach the end of an axon (the axon terminals), they stimulate the release of neurotransmitters. These chemical messengers carry a message from the sending neuron across a synapse to receptor sites on a receiving neuron.
What happens when an action potential reaches motor end plates?
When an action potential reaches the axon terminal of a motor neuron, vesicles carrying neurotransmitters (mostly acetylcholine) are exocytosed and the contents are released into the neuromuscular junction. These neurotransmitters bind to receptors on the postsynaptic membrane and lead to its depolarization.
What happens when an action potential reaches a neuromuscular junction?
When an action potential reaches a neuromuscular junction, it causes acetylcholine to be released into this synapse. The acetylcholine binds to the nicotinic receptors concentrated on the motor end plate, a specialized area of the muscle fibre’s post-synaptic membrane.
How does an action potential travel down an axon?
The action potential travels down the axon as the membrane of the axon depolarizes and repolarizes. Nodes of Ranvier are gaps in the myelin along the axons; they contain sodium and potassium ion channels, allowing the action potential to travel quickly down the axon by jumping from one node to the next.
When an action potential arrives in an axon terminal synaptic vesicles containing acetylcholine?
When an action potential arrives in an axon terminal, synaptic vesicles containing acetylcholine are released by: exocytosis.
When an action potential reaches the end of an axon the release neurotransmitters?
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels.