Question at position 6 Gap junctions are present in which type of muscle tissue? only smoothonly cardiaconly skeletalonly cardiac and smoothall three types of muscle tissue

Question

Question at position 6  Gap junctions are present in which type of muscle tissue? only smoothonly cardiaconly skeletalonly cardiac and smoothall three types of muscle tissue

BlackTom AI · Accepted Answer

When considering gap junctions in muscle tissue, it's important to recall their role in electrical coupling and rapid, coordinated contraction.
Option 1: 'only smooth' would be incorrect because cardiac muscle also contains gap junctions that facilitate synchronized heartbeats.
Option 2: 'only cardiac' is also incorrect since smooth muscle cells communicate with gap junctions to coordinate peristaltic and other actions, not just cardiac muscle.
Option 3: 'only skeletal' is inaccurate because skeletal muscle fibers are typically electrically isolated and contract in a more individually controlled manner; they generally lack functional gap junctions as a syncytial network.
Option 4: 'only cardiac and smooth' matches the established fact that both cardiac and smooth muscles possess gap junctions (connexons) enabling electrical coupling and rapid communication between cells.
Option 5: 'all three types of muscle tissue' is incorrect because skeletal muscle lacks functional gap junctions in the same way the other two types do.

In summary, gap junctions are characteristic of cardiac and smooth muscle tissues due to their need for synchronized contraction, whereas skeletal muscle does not rely on gap junctions for its contraction coordination.

Question at position 6 Gap junctions are present in which type of muscle tissue? only smoothonly cardiaconly skeletalonly cardiac and smoothall three types of muscle tissue单项选择题

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