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The presence of a refractory period caused by the locking of Na channel in the closed position. The happens just after the Na has passed through it and is not influenced by the voltage. This means that that section of the cell cant be depolarised again for a while and so the AP cant go backwardes.
What else can I help you with?
Which of the following does not factor into the rate of impulse propagation?
One factor that does not influence the rate of impulse propagation is the size of the neuron. The rate of impulse propagation is determined mainly by the myelination of the axon, the presence of nodes of Ranvier, and the diameter of the axon.
A nerve impulse starts at the dendrite then travels to the?
cell body, continues down the axon, and finally reaches the axon terminal. At the axon terminal, the impulse triggers the release of neurotransmitters to communicate with other neurons or muscles.
An electrical impulse moving down an axon is called what?
An electrical impulse moving down an axon is known as an action potential.
How does myelin insulate an axon to enhance the speed and efficiency of nerve impulse conduction?
Myelin is a fatty substance that wraps around the axon of a neuron, forming a protective sheath. This insulation helps to speed up the transmission of nerve impulses by allowing the electrical signal to jump from one node of Ranvier to the next, rather than traveling along the entire length of the axon. This process, known as saltatory conduction, increases the speed and efficiency of nerve impulse conduction.
Where does a nerve impulse start?
A nerve impulse typically starts at the dendrites of a neuron, where it receives signals from other neurons or sensory receptors. These signals are then transmitted down the axon of the neuron to the axon terminals, where they can communicate with other neurons or target cells.
Does the impulse cross the neuromuscular junction when a muscle contracts?
No, the impulse traveling down the axon ends at the axon terminal but causes the axon terminal to release neurotransmitters. The neurotransmitters diffuse across the synaptic cleft causing the sarcolemma of the muscle to initiate its own impulse.
When an axon is not conducting an impulse is known as?
When an axon is not conducting an impulse, it is said to be in a resting state. This is when the axon maintains a negative charge inside relative to the outside.
Which of the following does not factor into the rate of impulse propagation?
One factor that does not influence the rate of impulse propagation is the size of the neuron. The rate of impulse propagation is determined mainly by the myelination of the axon, the presence of nodes of Ranvier, and the diameter of the axon.
How are nerve impulses prevented from traveling the wrong way on axon?
On the axon hillock, there is a concentration of sodium channels whose role are to initiate the depolarization and signal transmission allong the axon. Once the all or none threshold is reached, depolarization occurs in a cascade unidirectional along the length of the axon, with potassium channels open just following the sodium-channel mediated depolarization, such that there is no back-propagation of the signal.
A nerve impulse starts at the dendrite then travels to the?
cell body, continues down the axon, and finally reaches the axon terminal. At the axon terminal, the impulse triggers the release of neurotransmitters to communicate with other neurons or muscles.
What is nother name for an impulse transmitter?
axon
Impulse generator and transmitter?
axon terminal
What sends an impulse to a muscle or gland?
axon
What acts as an impulse generator and transmitter?
axon
What carries an impulse away from neuron?
The axon.
What influences the speed of a nerve impulse?
the diameter of an axon
What carries impulses away from neuron cell bodies?
The axon of the neurone carries the impulse away from the cell body. The axon of the neurone carries the impulse away from the cell body.
