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In a myelinated fiber only the initial segment in the trigger zone have voltage-regulated channels?
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Where do most action potentials originate?
initial segment
The trigger zone of a neuron includes?
The axon hillock and the initial segment
Which is NOT a segment of GPS?
which is not a segment of gps?
How does conduction differ on myelinated vs unmyelinated axons?
Very simples, myelinated axons have a myelin sheath! These are produced by the schwann cells in the Peripheral Nervous System and oligodendrocytes in the Central Nervous System. The myelin sheath is made out of lipids (fats) and proteins. The benefits of a myelinated axons is a faster transmission of an electrical impulse and also insulation. The breakdown of a myelin sheath from a medical background results in Demyelination.Tortora, G, Derrickson, B (2009) Principles of Anatomy and Physiology, Wiley, Asia, 12th Edition, Volume 1, Pages 416-423Hope this helps!
A line segment with one endpoint at the center of a circle?
The answer depends on where the other end of the line segment is. If it is on the circumference the segment is a radius. Otherwise, it is indeterminate.
What spinal segment structure carries non-myelinated GVE fibers?
The white ramus communicans carries non-myelinated GVE fibers.
What is the difference between an internode and node of ranvier?
A Node of Ranvier is the space between two myelinated segments on an axon, while an internode is the space between two Nodes of Ranvier (alternativenly, the myelinated segment).
What is the very beginning of the axon called?
initial segment
Where do most action potentials originate?
initial segment
The trigger zone of a neuron includes?
The axon hillock and the initial segment
Who was the narrator in the opening segment of the movie 'Portrait of Jennie'?
The narrator in the opening segment of Portrait of Jennie is uncredited. The narrator that takes over after the initial segment is Joseph Cotten in the role of Eben Adams.
Why do companies use marketing channels?
Through right channel companies will serve directly and rightly to the desired segment with the cost minimization.
What is the fastest-growing segment of electronic communication?
It may come as a surprise that the fastest-growing segment of electronic commerce involves not business-to-consumer, (called B2C in today's Web language) but business-to-business (B2B) channels.
What is an initial segment of a nerve impulse?
Axon hillock- a pyramidal shaped region where all axons originate fromInitial segment- an area just beyond the axon hillock where all the stimulatory and inhibitory signals coming into the neuron are algebraically summed and it is decided whether or not an action potential should propagate or not.-----The above describes the structure of the axon where the action potential is created.However, the actual nerve impulse (action potential) is generated in a series of steps based on how the ion channels trigger.In this respect the first segment of the nerve impulse is the stimulus, which has to trigger positive ion influx beyond a given threshold.After that stimulus exceeds the threshold, it triggers the opening of ion channels which pump sodium ions into the axon and potassium ions out, thus increasing the net positive charge on the inside of the neuron, depolarizing it and initiating the action potential (the nerve impulse).
Why does action potential's move through axons in only one direction?
the axons and dentrites would get mixed up and the brain would be thinking in two ways and we would be confused to which one was which
Why does Letterman run across the stage?
It got him up for the opening segment and increased his adrenaline for the initial gab fest. Also, it reportedly was something he started after his quintuple-bypass surgery.
Where can one find the most current baseball news?
MLB has a web site where you can get the most current baseball news. All of the ESPN channels on cable or satellite always have a segment that keeps you current with baseball news.
