Which of the following is TRUE?

Question

BlackTom AI · Accepted Answer

Question at hand asks which statement about muscle cell types is true. 
Option 1: 'Cardiac muscle cells are shorter than skeletal muscle cells and are branched' This aligns with anatomical facts: cardiac muscle fibers are indeed shorter than typical skeletal muscle fibers, and they form a branched network connected by intercalated discs, enabling synchronized contraction. The branching and intercalated discs are key distinguishing features. 
Option 2: 'Smooth muscle cells are longer than skeletal and cardiac muscle cells' In reality, smooth muscle cells are spindle-shaped and relatively small; they are not longer than skeletal muscle fibers, so this is incorrect. 
Option 3: 'Cardiac muscle cells are longer than skeletal and smooth muscle cells' This contradicts the known length relationship, since skeletal muscle fibers can be quite long and cardiac cells are comparatively shorter, making this statement false. 
Option 4: 'Smooth muscle cells are smaller than skeletal muscle cells and are branched' Smooth muscle cells are not branched; they are spindle-shaped and form single-unit (visceral) sheets or multiunit arrangements, but branching is characteristic of cardiac muscle, not smooth muscle. Therefore this description is inaccurate. 
In summary, evaluating each option against established cellular morphology shows that the first statement accurately reflects the shorter length and branching of cardiac muscle cells, while the others misstate size, shape, or structural features of smooth and cardiac muscle cells.

Which of the following is TRUE?单项选择题

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