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.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Support and Movement
738 free Support and Movement MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Support and Movement questions
Once the myosin head has become attached to the actin filament:
Calcium ions bind with the troponin molecule and cause them to:
During muscle contraction, the cross-bridges of thick filaments become attached to:
T -system extends and encircles the myofibril at the level of:
It causes muscle pH to drop when the muscle suffers from:
It increases the excitability of neurons and results in loss of sensation: