INTRODUCTION TO MICROSCOPY CELL BIOLOGY
CELL JUNCTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which type of cellular junction is prominent in cardiac myocytes and allows for a unified contraction of the heart? Hint:in order for these cells to contract in unison, ions need to flow rapidly between them.
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Tight
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Desmosomes
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Gap
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Plasmodesmata
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Explanation:
Detailed explanation-1: -Gap junctions are common in the muscle tissue of animals’ hearts, for example, as they allow ions to pass rapidly from cell to cell to coordinate cardiac muscle contraction.
Detailed explanation-2: -Gap junctions within the intercalated disks allow impulses to spread from one cardiac muscle cell to another, allowing sodium, potassium, and calcium ions to flow between adjacent cells, propagating the action potential, and ensuring coordinated contractions.
Detailed explanation-3: -Intercalated disks (ICDs) are highly organized cell-cell adhesion structures, which connect cardiomyocytes to one another. They are composed of three major complexes: desmosomes, fascia adherens, and gap junctions.
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