The force generated for a given muscle during a contraction is determined by the
ID: 283496 • Letter: T
Question
The force generated for a given muscle during a contraction is determined by the number and rate of motor unit activation, as well as the size of the motor units (which is influenced by the number of muscle fibers in the motor units and the fibers' cross sectional area). Let's consider how differences in these values influence force production and control of movements. Consider the following values for the biceps brachii muscle in men and women: Muscle fibers typically produce about 30 N/cm^2. Why is force production related to cross-sectional area (i.e., N per cm^2)? (What produces force in muscles, and why would differences in muscle fiber cross-sectional area lead to a difference in force production?) It's related to the force-frequency relation. It's related to the force-length relation. It's related to motor unit recruitment. It's related to muscle fiber type. It's related to the number of cross-bridges in parallel. It's related to the number of cross-bridges in series. Now let's consider why men typically produce more force than women even though they have the same innervations ratio (750), number of muscle fibers (580,000). and percentage of type II fibers (58%). How much force would all type II fibers in the biceps brachii of a man produce? (Fill-in-the-blank. Include appropriate units.) How much force would all type II fibers in the biceps brachii of a woman produce? (Fill-in-the-blank. Include appropriate units.)Explanation / Answer
answer- it is given that the force produce by muscle fibre is F= 30 N/cm2
there is strong relation between maximam force generated by muscle fibre and cross sectional area of muscle fibre. and also relation between training status means (person who do weightliftng and person who dont do weightlifting), cross sectional area of muscle fibre and driving force by the muscle. a person who do weightlifting have larger force to cross section area ratios. and who do not to weight training have smaller force to cross sectional area ratios. female weightlifter have larger force cross sectional area ratios than the male who do not do weightlifting
the force generated in the muscle depend on the its length and shortening velocity of the muscle.
smaller the cross sectional area of muscle leads to smaller the force production, and larger the area of muscle larger will be force production . it related to force length relation (B).
answer- the amount of force produce by the type II muscle fibre in the biceps brachi of men will be 0.026N/cm2
answer- the mount of force produce by the type II muscle fibre in the biceps brachi of women will be 0.018 N/cm2
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