Skeletal muscles usually consist of several distinct types of muscle fibers. Dif

Question

Skeletal muscles usually consist of several distinct types of muscle fibers.

Different muscle fiber types in the same muscle become apparent when certain dyes are applied, as seen in the stained micrograph on the right.

Each muscle fiber types has a unique set of contractile properties. The following graphs plot the force of muscle fiber contractions in response to a single stimulus (a single potential, shown as one black arrowhead), a short burst of stimuli (a rapid succession of action potentials, shown as a sequence of black arrowheads), and repeated bursts of stimuli (a sustained succession of action potentials, shown as a continuous black bar).

In each row of the following table, identify the muscle fiber type or types described by each statement. Check all that apply.

1). When these muscle fibers experience a short burst of stimuli, tetanus lasts for less than 1,000 milliseconds. Type A, Type B or Type C

2) In response to short bursts of stimuli, this muscle fiber type exhibits the longest tetanus period. Type A, Type B, or Type C

3) A single twitch of this type produces the greatest amount of force among the three muscle fiber types. Type A, Type B, Type C

Based on how these three muscle fiber types respond to different stimuli, ____(1)_____ fibers are most likely to be abundant in muscles that contract strongly yet are resistant to fatigue. These fibers are also known as ___(2)_____ muscle fibers.

(1) a) Type B b) Type A c) Type C

(2) a) fast aerobic b) fast anaerobic c) slow

Explanation / Answer

In point 1 type A & type B muscle fibers experience a short burst of stimuli, tetanus lasts for less than 1,000 milliseconds

In point B type C muscle fibre exhibot longest tetanus period

In point C greatest amount of force produce by type A muscle fibres

1 type c most likely to be abundant in muscles

2 they are slow type mucle fibre option c is correct they are red fibre resistant to fatigue used during maintain posture amd run a marathon.

However fast aerobic are also present which are resistant to fatigue used during walking.

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