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Questions and Answers
What gives individual cardiac muscle fibers a 'stair-step' appearance?
What gives individual cardiac muscle fibers a 'stair-step' appearance?
- Nuclei distribution
- Branching (correct)
- Circular shape
- Length
What is the typical length of a cardiac muscle fiber?
What is the typical length of a cardiac muscle fiber?
- 100–150μm
- 20–50μm
- 50–100μm (correct)
- 150–200μm
What is the approximate diameter of a cardiac muscle fiber?
What is the approximate diameter of a cardiac muscle fiber?
- 10μm
- 14μm (correct)
- 20μm
- 25μm
What connects the ends of cardiac muscle fibers to neighboring fibers?
What connects the ends of cardiac muscle fibers to neighboring fibers?
What occupies 25% of the cytosolic space in a cardiac muscle fiber?
What occupies 25% of the cytosolic space in a cardiac muscle fiber?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?
What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?
How do cardiac muscle fibers differ from skeletal muscle fibers in terms of length and shape?
How do cardiac muscle fibers differ from skeletal muscle fibers in terms of length and shape?
What is the primary role of gap junctions in cardiac muscle fibers?
What is the primary role of gap junctions in cardiac muscle fibers?
What is the typical diameter of a cardiac muscle fiber?
What is the typical diameter of a cardiac muscle fiber?
What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?
What is the approximate percentage of cytosolic space occupied by mitochondria in cardiac muscle fibers?
What is the typical length of a cardiac muscle fiber?
What is the typical length of a cardiac muscle fiber?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the approximate diameter of a cardiac muscle fiber?
What is the approximate diameter of a cardiac muscle fiber?
What gives individual cardiac muscle fibers a 'stair-step' appearance?
What gives individual cardiac muscle fibers a 'stair-step' appearance?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the primary function of intercalated discs in cardiac muscle fibers?
What is the significance of the larger and more numerous mitochondria in cardiac muscle fibers?
What is the significance of the larger and more numerous mitochondria in cardiac muscle fibers?
What allows the entire myocardium of the atria or the ventricles to contract as a single, coordinated unit?
What allows the entire myocardium of the atria or the ventricles to contract as a single, coordinated unit?
What is the approximate length of a typical cardiac muscle fiber?
What is the approximate length of a typical cardiac muscle fiber?
What is the characteristic feature of the ends of cardiac muscle fibers connecting to neighboring fibers?
What is the characteristic feature of the ends of cardiac muscle fibers connecting to neighboring fibers?
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