Which of the following is true regarding cardiac muscle fibers compared to skeletal muscle fibers?
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Correct answer: Cardiac fibers are branched and joined by intercalated discs.
Cardiac muscle fibers consist of individual cells (cardiomyocytes) that are branched. They are connected end-to-end by intercalated discs, which contain gap junctions for electrical coupling and desmosomes for mechanical adhesion.
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More Muscle Fibers questions
- Which of the following describes Type I skeletal muscle fibers?
- In a histological section stained for ATPase activity, which fiber type would appear darkest at a high pH (9.4)?
- Which skeletal muscle fiber type is characterized by having the largest diameter and the lowest resistance to fatigue?
- The 'red' color of certain muscle fibers is primarily attributed to high concentrations of which protein?
- Which organelles are significantly more numerous in Type I muscle fibers compared to Type IIb fibers?
- Type IIa muscle fibers are often referred to as 'intermediate' because they: