All the fibers innervated by a single motor neuron contract:
Correct answer: B. Simultaneously
- A. One after other
- B. Simultaneously
- C. Separately
- D. Now or then simultaneously
Explanation
The contraction of each muscle fiber is based on the "All or none" principle i.e. all of its fibrils participate in contraction. The degree of contraction depends at once upon the number of fibers that participate in the contraction.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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