Choose best answer 1. Muscle A and Muscle B have identical external dimensions.
ID: 300650 • Letter: C
Question
Choose best answer
1. Muscle A and Muscle B have identical external dimensions. Muscle A consists of 75% type I fibers and 25% type II fibers; Muscle B consists of 25% type I fibers and 75% type II fibers. Based on this information only, true statements about these muscles include the following:
a. Muscle B is stronger than Muscle A.
b. Muscle B can shorten more rapidly than Muscle A.
c. Muscle B has a higher peak power than Muscle A.
d. all of these.
2. During a concentric contraction, a skeletal muscle can develop maximum power output when active force is about what percent of maximal isometric force?
a. 0%
b. 30%
c. 50%
d. 90%
3. Glycolytic capacity of a skeletal muscle fiber is most likely to be increased by the following type of training:
a. continuous long duration activity.
b. low load, fast velocity, high power activity.
c. slow velocity, heavy resistance (high load) training.
d. eccentric training.
4. Which of the following muscle contractions occur(s) in a person who performs a bench-stepping task leading with the right leg (i.e., up right, up left, down right, down left)?
a. right knee extensors--concentric
b. left knee extensors--eccentric
c. right plantar flexors (ankle extensors)--eccentric;
d. all of these.
Explanation / Answer
Ans 1) b) Muscle B can shorten more rapidly than muscle A
This is because on making a comparison the muscle that contains more Type I Fibers are much stronger and fatigue less as compared to muscle that contain more of Type-II fibers. The Type I fibers are more rich in muscle A which means they are more efficient at using the energy for generation of ATP and helps in extended muscle contractions over long time.