Which of the following is an incorrect statement about cell junctions?

ACell junction structures belong to the extracellular matrix
BCardiac muscle contraction depends on gap junctions
CTight junctions in intestinal epithelial cells ensure directional transport of substances
DStructural characteristics of cell junctions can only be observed under an electron microscope

Correct answer: A. Cell junction structures belong to the extracellular matrix

Cell junction structures are not part of the extracellular matrix; they are specialized structures that connect and seal adjacent cells. The other statements are correct.

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