How are gap junctions formed and degraded.?
919609
I have never heard of gap junctions. I don't believe they exist in Geology.
122034
An impulse in an axon is like a wave of depolarisation on the neurone's membrane.\nWhen it reaches a synapse the depolarisation (action potential) causes the release, from the axon of the neurone, of a transmitter chemical.\nIt is the transmitter chemical that diffuses across the synaptic gap to bind with receptors in the next structure (another neurone or an effector, e.g. muscle) that causes the next event.\nSo the structures and mechanism at the synapse are rather like a one-way valve - the process cannot work in reverse.\nSince impulses are initiated in only one direction, impulse transmission in axons is always in one direction (though if you initiate an action potential in an axon experimentally it will propagate in both directions, but of course can only cross a synapse in one direction).\n\nBe careful with your use of the word 'nerve'. A nerve is a collection of many axons. There are some nerves which contain axons carrying impulses in opposite directions - these are known as mixed nerves.
528620
So, I don't know if that last word was supposed to be photoelectrons or photons.  So, I'll do both.\n\nIf there is an energy gap, and the energy of the photon is sufficient to promote an electron from one of the energy states in the fermi sea to an allowed energy state above the gap, the electron can be promoted to a state above the energy gap, and a hole will be produced in the state it came from.  Because there are lots of vacant energy states above the energy gap, the electron is in the conduction band, and can move around lots...  That's how you get photoelectrons.\n\nNow, photons would be produced when those photoelectrons recombine with holes.  The photoelectron has some finite lifetime, after which it will recombine with a hole (probably not the same one).  This will result in the electon losing energy in the form of a photon.
416619
C) By interfering with the electron transport chain, energy production (in the form of ATP) would be significantly reduced.  Neurons use a great amount of energy to maintain the ionic gradient that allows synaptic transmission.  In he absence of ATP, the ionic pumps, primarily sodium/potassium, would not function, the ionic gradient would break down, and it would halt neuronal transmission.
332420
ummm, i dont understand what ur asking, but if u wanna know how its generated, it has something to do with positive ions of a molecule flowing in one direction, and negative ions flowing in either the same of opposite direction forming direct and indirect currents, or at least that's what i think it is
799897
Asexual mitospores (spores formed by mitosis) form within the sporangia (thousands of spores) or sporangioles (single spore or a few). They are released when mature by the disintegration of sporangium wall. The sporangioles containing one spore can have their wall fused with spore wall. In that case, the whole sporangioles separate from the fungus, and are carried by wind like conidia. \n\nGermination of these spores forms the haploid hyphae of a new mycelium. Asexual reproduction occurs continuously. \n\nSexual reproduction occurs only when opposite mating types (designated + and -) come in contact. Then special cells become gametes that fuse forming a zygote. The zygote develops a resistant cell wall, forming a zygospore, the characteristic that gives its name to this group of fungi. Subsequently, the zygospore germinates and forms a sporangiophore whose sporangium produces both + and - haploid spores.
752479
an electrical wave that travels down the membrane of a cell
954358
Its the same principle as a welding arc. when the bulb goes out the philament breaks into two pieces. When they split apart, before they get too far apart, the electricity jumps the gap causing a bright flash. After that the current cant make the leap so the bulb is dead.
309339
Transmission of the signal requires a complete cellular membrane, because the signal is a waveform traveling along that membrane.  Cutting the axon (which is done in studying axonal regrowth and regeneration) disrupts the membrane integrity, thus no signal can pass this point.  In some neurons, the axon can travel as much as 3 feet, and damage done at the proximal end of the axon can take months to regrwo.  However, if you are talking about loss of the presynaptic terminal only (as occurs in some diseases), then reconnection could occur within hours or days.
806047
the electron transport chain occurs in the inner membrane.  the krebbs cycle occurs in the inner matrix and glycolysis occurs in the cytoplasm of the cell
732842
Membrane proteins.\n\nSome membrane proteins act as channel proteins that allow for passive diffusion of solutes across the membrane.\n\nOthers are transport proteins that take part actively (require energy) in transport across the membrane. Some transport proteins may be gated.
730401
Different chemical species are connected by some means that allows ions to flow between them, but does not allow them to mix.   The different chemical species are chosen so that one of them undergoes oxidation, or loss of electrons, while the other undergoes reduction, or gain of electrons.\n\nWires connect to each of the chemical species and to positive and negative terminals of the battery.  When they are used, electrons flow into the wire from the oxidizing side, through the circuit and return to the reducing side.\n\nA simple cell that shows this flow can be made from a lemon and two different pieces of metal (like a copper wire and a length of solder).  Just push the pieces of metal into the lemon and you can measure a voltage from one wire to another.\n\nCommercial batteries are a bit more complex in construction.
732977
Nuclear membrane is formed by a series of  flattened cistenae aligned sideways with gaps called nuclear pores. There are pore complexes guarding the nuclear pores.The flattened cisternae are smooth- surfaced endoplasmic reticulum. It is a typical biological membrane of lipo-protein.\nPlasma membrane is glyco-lipoprotein complex.The overcoat of the plasma membrane is made by the Golgi Complex. It is a complex of carbohydrate side chains along with proteins.The overcoat lies over the bilayer of lipid through with proteins lie across: some  projected,  others buried in the bilayer of lipid. Plasma membrane contains several enzymes and channels connected with transport of ions and small molecular weight substances.
347377
At the very basics it has to do with magnetic fields. When a conductor (ie copper wire) is move across (perpendicular to) a magnet-ic field it causes the electrons in the copper wire to move\n\nthis is very basic info and their are other ways like solar cells (due to electron excitment in a different manner)
221295
look at this website\n\nhttp://www.liv.ac.uk/~petesmif/teaching/1bds_mb/notes/pores/text.htm
462411
Mostly epithelial motifications for collecting sensory impulses which are synaptic..an action potential forms after depolarization caused by a threshold stimulus
911568
My best guess would be that the chloroplast would be marked as \n"non-self" in the cell and would be degraded in the lysosome. It would be might complicated to keep the chloroplast from being degraded.