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At a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap.
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At and synapse
At the same synapse ( but not the unstimulated synapse ), local protein synthesis creates a short-lived ( less than three hours ) synaptic tag.
At gap junctions, such cells approach within about 3. 5 nm of each other, a much shorter distance than the 20 to 40 nm distance that separates cells at chemical synapse.
At the level of the closed medulla oblongata, these axons synapse with neurons in the gracile nucleus and cuneate nucleus.
At birth, Schwann cells form loose, unmyelinated covers over groups of synapses, but as the synapse matures, Schwann cells become dedicated to a single synapse and form a myelinated cap over the entire neuromuscular junction.
At the most basic level, the CNS synapse and the NMJ both have a nerve terminal that is separated from the postsynaptic membrane by a cleft containing specialized extracellular material.
At this point the upper motor neuron will synapse with the lower motor neuron whose axons will innervate skeletal muscle .< ref >" Frontal Lobe.
At and membrane
At any one moment, about 25 % of the plasma membrane of a fibroblast is made up of coated pits.
At the nerve ending in the neuromuscular junction, where the impulse is transferred to the muscle cell, the nerve impulse leads to the transfer of vesicles with the neurotransmitter acetylcholine to " active zones " in the presynaptic membrane, where it is released into the synaptic cleft and stimulates the acetylcholine receptor on the muscle.
At rest, each heart muscle cell has a negative charge, called the membrane potential, across its cell membrane.
At that time, it was thought that the blood vessels themselves were responsible for the barrier, since no obvious membrane could be found.
At the mitochondrial inner membrane, electrons from NADH and succinate pass through the electron transport chain to oxygen, which is reduced to water.
# At least one of the conformations creates a channel through the membrane that is permeable to specific types of ions.
At this stage, the membrane potential reaches a maximum.
At the peak of the action potential, the sodium permeability is maximized and the membrane voltage V < sub > m </ sub > is nearly equal to the sodium equilibrium voltage E < sub > Na </ sub >.
At times, the mucous membrane around the uvula may swell, causing the uvula to expand 3 – 5 times its normal size.
At very high sound pressure levels, muscles in the ear tighten the tympanic membrane and this leads to a small change in the geometry of the ossicles and stirrup that results in lower transfer of force to the oval window of the inner ear ( the acoustic reflex ).
* At birth, the skull features a small posterior fontanelle, an open area covered by a tough membrane, where the two parietal bones adjoin the occipital bone ( at the lambda ).
At each successive node, the membrane potential of the axon is thereby brought to the threshold potential to initiate an action potential.
* Nasal lining — At the vestibule, the human nose is lined with a mucous membrane of squamous epithelium, which tissue then transitions to become columnar respiratory epithelium, a pseudo-stratified, ciliated ( lash-like ) tissue with abundant seromucinous glands, which maintains the nasal moisture and protects the respiratory tract from bacteriologic infection and foreign objects.
At gap junctions, the intercellular space is 4 nm and unit connexons in the membrane of each cell are lined up with one another.
At in-use concentrations, triclosan acts as a biocide, with multiple cytoplasmic and membrane targets.
At the level of the cerebellum, the pia matter membrane is more fragile due to the length of blood vessels as well as decreased connection to the cerebral cortex.
At the point where the pia mater reaches the conus medullaris or medullary cone at the end of the spinal cord, the membrane extends as a thin filament called the filum terminale or terminal filum, contained within the lumbar cistern.
At the plasma membrane, some keratins interact with desmosomes ( cell-cell adhesion ) and hemidesmosomes ( cell-matrix adhesion ) via adapter proteins.
At the membrane, ARF-GTP is hydrolyzed to ARF-GDP by ARF GAPs.
At any given moment, there are two factors for an ion that determine how much influence that ion will have over the membrane potential of a cell.
At a site of active bone resorption, the osteoclast forms a specialized cell membrane, the " ruffled border ," that touches the surface of the bone tissue.
At the far end of the ear canal is the eardrum ( or tympanic membrane ), which marks the beginning of the middle ear.
At and axon
At the majority of synapses, signals are sent from the axon of one neuron to a dendrite of another.
At the axon hillock of a typical neuron, the resting potential is around – 70 millivolts ( mV ) and the threshold potential is around – 55 mV.
At the furthest end, the axon loses its insulation and begins to branch into several axon terminals.
At longer times, after some but not all of the ion channels have recovered, the axon can be stimulated to produce another action potential, but only with a much stronger depolarization, e. g., − 30 mV.
At any given moment, the patch of axon behind the actively spiking part is refractory, but the patch in front, not having been activated recently, is capable of being stimulated by the depolarization from the action potential.
At the junction of two Schwann cells along an axon, the directions of the directions of the lamellar overhang of the myelin endings are of opposite sense.
At the same time, the periaxonal extension of the glial cell wraps around the axon, giving rise to the paranodal regions.
At the same time, developing neurons send out axon outgrowths that contact their target cells.
At the same time, it is worth noting that in most cases pioneer neurons do not contain unique characteristics and their role in axon guidance can be substituted by other neurons.
At and closely
At the same time the vast majority of these resources are exported, integrating Canada closely into the international economy.
At Pennsylvania he worked closely with another student of Boas, Frank Speck and the two undertook work on Catawba in the summer of 1909.
At least two BBC Radio 4 dramatisations have also been aired, both of which follow the book very closely.
At all points West Germany was much larger and richer that East Germany, which became a dictatorship under the control of the Communist Party and was closely monitored by Moscow.
At the present time it is often closely aligned with the field of Science studies.
At this time most of the regional nobility were closely linked through kinship, and this behaviour towards their relatives was regarded as unacceptable.
At times kamacite can be found so closely intermixed with taenite that it is difficult to distinguish them visually, forming plessite.
At such universities, theological study was initially closely tied to the life of faith and of the church: it fed, and was fed by, practices of preaching, prayer and celebration of the Mass.
At the beginning of the 21st century, Beiderbecke's music continues to reside mostly out of the mainstream and some of the facts of his life are still debated, but scholars largely agree — due in part to the influence of Sudhalter and Evans — that he was an important innovator in early jazz ; jazz cornetists, including Sudhalter ( before his death in 2008 ), and Tom Pletcher, closely emulate his style.
At the time of publication, the authorship of the articles was a closely guarded secret, though astute observers guessed that Alexander Hamilton, James Madison, and John Jay were the likely authors.
At a time when English forces encountered setbacks in the Hundred Years ' War against France, and Edward III's rule was becoming unpopular due to high taxation and his affair with Alice Perrers, political opinion closely associated the Duke of Lancaster with the failing government of the 1370s.
" At the end of the 19th century, Edward Gibbs " renovated " the building to more closely represent the original Tudor farmhouse.
At 0000 GMT September 30, 1996 ( the start of GPS Week 873 ), WGS 84 was redefined again and was more closely aligned with International Earth Rotation Service ( IERS ) Terrestrial Reference Frame ( ITRF ) 94.
At the same time, though, the crown became so closely identified with Fascism that by the time Victor Emanuel was able to shake himself loose from it, it was too late to save the monarchy.
At Yu Suzuki's insistence, the game's environment and culture adhere closely to this period.
At the same time, Holmes was closely associated with the Wonderland Gang, a group of heroin-addicted cocaine dealers, so-called for the location of their hideout: a rowhouse located on Wonderland Avenue in the wooded Laurel Canyon neighborhood of Los Angeles.
At one time, the elephant-sized Megatherium was thought to be closely related, but is recognized as belonging to a separate family ( Megatheriidae ).
At this crossing, the road runs closely parallel to a Conrail Shared Assets Operations railroad line before entering Petersburg, where it splits from the railroad tracks and comes to a crossroad with CR 610.
At Bell Labs, Aho worked closely with Steve Johnson and Jeffrey Ullman to develop efficient algorithms for analyzing and translating programming languages.
At the turn of the 19th to 20th century, " Kimigayo " was beginning to be closely associated with the idea of honoring the Emperor.
At one extreme, it more closely resembles what everyday English-speakers call " influence ", although some authors make a distinction between power and influence – the means by which power is used ( Handy, C. 1993 Understanding Organisations ).
At the next exit, Gun Hill Road, the Williamsbridge station serving that neighborhood on Metro-North Railroad's Harlem Line, which closely parallels the parkway from this point on, is located immediately west of the highway.
At some time this is recognized and a movement is organized to merge more closely.
At the same time Cecil had intimate contact with the King because Edward worked closely with the secretaries of state.
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