A motor unit is made up of:
Correct answer: B. A motor neuron and the muscle fibers it innervates
- A. All the muscle fibers within a given muscle
- B. A motor neuron and the muscle fibers it innervates
- C. All the neurons going into an individual section of a body
- D. A fascicle and a nerve
Explanation
A motor unit is indeed composed of a motor neuron and all the muscle fibers it innervates (connects to). When the motor neuron sends an electrical signal (action potential), all the muscle fibers within that motor unit contract simultaneously. Motor units vary in size and can include a few to many muscle fibers, depending on the precision and strength required for the muscle's function.
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
According to sliding filament theory, when muscle fibers are stimulated by nervous system, which of the following changes occurs?
Which triggers the release of calcium ions from: sarcoplasmic reticulum?
Contractile protein of skeletal muscle cells involving ATPase activity is:
It acts as an immediate source of energy for muscle contraction.
When muscle contracts, thick and thin filaments undergo:
The muscles that are attached to the skeleton are: