Biology / Bio 0313 · Atom · ~20 seconds
Gap Junctions
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A gap junction is a protein-lined channel, built from six connexin proteins forming a connexon, letting ions and small molecules pass between adjacent animal cells.
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Gap junctions let the signal to contract pass rapidly between cardiac muscle cells, so the heart's chambers contract in tandem.
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A gap junction is the animal counterpart to a plasmodesma, though structurally distinct.