gap junction
Quick Summary
A gap junction is a point of contact between adjacent cells that allows for intercellular communication and the transfer of small molecules. These junctions are formed by proteins that span the cell membrane, creating channels that connect the cytoplasm of neighboring cells.12
Through gap junctions, small molecules such as inorganic salts, sugars, amino acids, nucleotides, and vitamins can pass directly from one cell to another. However, larger molecules like proteins and nucleic acids cannot.2
Gap junctions are vital for coordinating cellular activities. In tissues like heart muscle, they allow electrical currents to pass between cells, enabling synchronized contractions. In other tissues, they facilitate the transport of nutrients and waste products, a process known as metabolic coupling. They also play a role in embryonic development by helping to establish differences between cell groups.2
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animalThe nervous system…by the formation of membrane-bound gap junctions, which connect adjacent cells, enables an impulse to pass unimpeded to a connecting cell. The increase in speed of transmission provided by a gap junction, however, is offset by a loss in flexibility; gap junctions essentially create a single neuron from several. The…
Read More…by the formation of membrane-bound gap junctions, which connect adjacent cells, enables an impulse to pass unimpeded to a connecting cell. The increase in speed of transmission provided by a gap junction, however, is offset by a loss in flexibility; gap junctions essentially create a single neuron from several. The…
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nervous systemAxon…synaptic gap; instead, there are gap junctions, direct channels between neurons that establish a continuity between the cytoplasm of adjacent cells and a structural symmetry between the pre- and postsynaptic sites. Rapid neuronal communication at these junctions is probably electrical in nature. (For further discussion, see below Transmission at the…
Read More…synaptic gap; instead, there are gap junctions, direct channels between neurons that establish a continuity between the cytoplasm of adjacent cells and a structural symmetry between the pre- and postsynaptic sites. Rapid neuronal communication at these junctions is probably electrical in nature. (For further discussion, see below Transmission at the…
Read More- nervous systemElectrical transmission
Transmission takes place through gap junctions, which are protein channels that link the cellular contents of adjacent neurons. Direct diffusion of ions through these junctions allows the action potential to be transmitted with little or no delay or distortion, in effect synchronizing the response of an entire group of…
Read MoreTransmission takes place through gap junctions, which are protein channels that link the cellular contents of adjacent neurons. Direct diffusion of ions through these junctions allows the action potential to be transmitted with little or no delay or distortion, in effect synchronizing the response of an entire group of…
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