An electrical synapse is formed by ______, channels that link the membranes of adjacent cells allowing direct transmission of ions and other large compounds, such as ATP.

Question

BlackTom AI · Accepted Answer

When evaluating how electrical synapses transmit signals between neurons, consider the structural components that physically connect cell membranes.
Option 1: gap junctions. These are specialized intercellular channels that directly connect the cytoplasms of adjacent cells, allowing ions and small molecules to pass straight through, which matches the description of an electrical synapse and the transfer of ions and larger molecules like ATP. This makes this option the correct one.
Option 2: tight junctions. Tight junctions seal adjacent cell membranes to prevent leakage of solutes between cells, thereby maintaining separate internal environments rather than forming direct cytoplasmic continuity for ion flow. Therefore, they do not constitute electrical synapses.
Option 3: desmosomes. Desmosomes provide strong adhesion between cells by linking cytoskeletal filaments, contributing to tissue mechanical stability rather than enabling direct ionic transmission between cell interiors. They are not conduits for ion flow between neurons.
Option 4: membrane pores. While this term is somewhat generic, it does not refer to a defined cellular structure in neurons responsible for direct electrical coupling. In textbooks, the functional equivalent is described by gap junction channels rather than a vague 'membrane pores.'
Overall, only gap junctions fit the description of channels that link adjacent cell membranes to permit direct transmission of ions and small molecules, which underpins electrical synapses.

An electrical synapse is formed by ______, channels that link the membranes of adjacent cells allowing direct transmission of ions and other large compounds, such as ATP.单项选择题

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