Question

question 1 (1.7 points)
potential benefit of recruiting slow oxidative fibers for contraction before recruiting fast oxidative and fast glycolytic fibers might be
a) because they are slower to respond, slow oxidative fibers must be stimulated first in order to contract simultaneously with the faster fibers
b) to allow for fine control with delicate contractile force with a small stimulus
c) recruiting slow oxidative fibers early helps to tire them out first so that they wont interfere with the more powerful contractions of fast glycolytic fibers
d) there is little to no benefit from recruiting slow oxidative fibers first, and therefore it is in fact fast glycolytic fibers that will be recruited first.

Explanation:

Slow oxidative fibers generate less force compared to fast - oxidative and fast - glycolytic fibers. Motor units with slow oxidative fibers are recruited first during low - intensity activities. This is because they can be activated with a smaller stimulus. Fine control of muscle contraction, such as in precise movements (e.g., writing), requires delicate contractile forces. Recruiting slow oxidative fibers first allows for this fine control as they can be activated with a small stimulus, and as the intensity of the activity increases, larger motor units (with fast - oxidative and fast - glycolytic fibers) are recruited.

• Option A: Slow oxidative fibers are not recruited first to contract simultaneously with faster fibers. Their recruitment order is based on the size principle (smaller motor units with slow fibers first) not to match contraction timing.
• Option C: Slow oxidative fibers are more resistant to fatigue compared to fast - glycolytic fibers. They are not recruited first to be tired out.
• Option D: There is a clear benefit (fine control with small stimulus) from recruiting slow oxidative fibers first.

Answer:

B. to allow for fine control with delicate contractile force with a small stimulus