Which characteristic is exhibited by type I muscle fibers?

Question

BlackTom AI · Accepted Answer

Examining the question about type I muscle fibers, we need to compare each option against the known features of slow-twitch fibers.
Option 1: Short-term contractions. This feature is more characteristic of fast-twitch (Type II) fibers, which generate quicker and more forceful contractions but fatigue faster. Type I fibers are not defined by short-term contractions; they are notable for endurance, not rapid peak force.
Option 2: Decreased oxygen delivery. In reality, type I fibers are highly oxidative and rely on a steady, abundant oxygen supply to sustain prolonged activity. They are adapted for aerobic metabolism, so decreased oxygen delivery would undermine their function, making this option incorrect.
Option 3: Slow to fatigue. This aligns precisely with the hallmark of type I fibers: they are slow-t contracting but highly resistant to fatigue due to high mitochondrial content, capillary density, and oxidative enzymes. This is a core distinguishing feature of slow-twitch fibers.
Option 4: Fewer capillaries. On the contrary, type I fibers typically have a dense capillary network to support sustained aerobic metabolism. Having fewer capillaries would impair oxygen delivery and endurance, so this statement is incorrect.
In summary, the statement that best describes type I muscle fibers is that they are slow to fatigue, reflecting their oxidative, endurance-oriented physiology, while the other options describe traits more associated with fast-twitch fibers or with reduced aerobic support.

Which characteristic is exhibited by type I muscle fibers?单项选择题

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