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What is electrochemical process of depolarization and repolarization along a nerve fiber?
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What is a change that initiates an electrochemical message along a neuron?
A stimulus A stimulus is a change that starts an electrochemical charge, an impulse, moving along a nerve cell.
What transmission of the depolarization wave along the neurons membrane?
Action potential
Why is action potential self regenerating?
By self regenerating, they mean that when you start an action potential, it continues in proximal (nearby) tissue (e.g., nerve). The depolarization of the action potential continues along the nerve.
Is Dissociation a process?
Dissociation is a process that occurs along a spectrum of severity
Is creation of an action potential part of the procsee of nerve conduction along an axon?
Indeed. You have saltatory conduction because of the presence of myelin in peripheral nerves, laid by Schwann cells. How AP is generated is via the following: WHen threshold potential is reached , voltage gated Na+ channels open, allowing huge Na+ influx. THis is called rapid depolarization. This is followed by a plateau phase, where the membrane potential is relatively flat because slow Ca2+ influx equalizes K+ efflux. The last thing is repolarization which is going to a negative membrane potential because more K+ channels open, Ca2+ channels closing and Na/K+ pump (Na+ pumped out, K+ in)
What is a change that initiates an electrochemical message along a neuron?
A stimulus A stimulus is a change that starts an electrochemical charge, an impulse, moving along a nerve cell.
What transmission of the depolarization wave along the neurons membrane?
Action potential
How is nerve impulse conducted along a myelinated nerve fiber?
In non-myelinated axons, the nerve impulse is going to be produced when the action potential accross a membrane makes a wave of depolarization followed by a wave of repolarization. With the absence of the myelin, the impulse is transmitted continuously throughout the membrane. In a non-myelinated nerve, once an end of the cell, the dendrite, is depolarized, the depolarization a.k.a., the action potential, moves along the nerve membrane, and the area of membrane immediately behind the depolarized section becomes repolarized.
What signal travels along the axon?
The high-speed signals that pass along the axon are called action potentials. They spread in a wave of depolarization.
What is the high-speed signals that pass along the axons of nerve cells called?
The high-speed signals that pass along the axon are called action potentials. They spread in a wave of depolarization.
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.
What makes a nerve impulse travel along an axon?
By a change in polarity as sodium ions enter the cell and potassium ions exit the cell, forming a wave of depolarization that travels along the axon until it reaches the axon terminal releases the neurotransmitters into the synaptic gap.By an action potential, which is a depolarization of the nerve cell membrane, the neurolemma.A nerve impulse gets transmitted along an axon in 5 steps: 1) Stimulus opens Sodium ion (Na+) channels at Resting Potential_ Must reach threshold to get Action Potential (A.P)2) Voltage sensitive Na+ channels open_ Na+ crosses into Intracellular fluid (ICF)_ Depolarize the cell (which is call "Depolarization")_ Reach +30 mV (mili voltage)3) Na+ channels close4) Voltage sensitive Potassium ion (K+) channels open_ K+ crosses out to ECF (extracellular fluid)_ Repolarize the cell (aka: repolarization)_ Reach -90 mV+ a hyperpolarization_ K+ channels close5) Na+/K+ (Sodium/ Potassium) pump restores concentrations_ Potential goes back to -70 mV: Returning to Resting Potential
Why is action potential self-regenerating?
By self regenerating, they mean that when you start an action potential, it continues in proximal (nearby) tissue (e.g., nerve). The depolarization of the action potential continues along the nerve.
Why is action potential self regenerating?
By self regenerating, they mean that when you start an action potential, it continues in proximal (nearby) tissue (e.g., nerve). The depolarization of the action potential continues along the nerve.
Is Dissociation a process?
Dissociation is a process that occurs along a spectrum of severity
What happens when a nerve impluse passes an axon?
When a neuron is activated by a stimulus, it's plasma membrane instantly becomes permeable to Na+ so these ions quickly diffuse into the neuron as Na+ channels close, the inward flow of Na+ for a brief instant causes the inside of the plasma membrane to become positively charged and the outside to become negatively charged at the point of stimulation, this switch in polarity is called depolarization which is considered the nerve impulse... depolarization is quickly followed by repolarization, once the impulse reaches it's effector, the axon tip forms a synapse (junction) with either another a neuron's dendrites, a muscle etc. which then continues to either pass the impulse along or create an outcome in the target cell.
Is the otoliths responsible for static equilibrium?
when the head moves, the otoliths move in response to variations in gravitational pull. As they deflect different hair cells, they trigger hyperpolarization or depolarization of the hair cells and modify the rate of impulse transmission along the vestibular nerve
