We don't use all our muscle fibers in a particular muscle all at once because they get damaged when we use them. If the muscle becomes weak, then it hinders the ability to continue with using the muscle making it difficult for our human survival. At times it is possible to use all the muscle fibers (and many have been documented) at once but only possible for very short instances as it requires lots of energy which is stored in the muscle. The muscle will often break down after the action where it may not be possible for the muscle to be used (at least not at normal strength) for several weeks even months. Its a subconscious effect and will not be possible for a person to do it consciously.
False
False
No. Cardiac muscle fibers.
Basically, yes. All muscle (skeletal, cardiac and smooth) are made of muscle fibers.
Motor neurons and the muscle fibers they transmit signals toA motor unit is a collection of muscle fibers that contract as a single functional unit when stimulated by an impulse from a motor neuron. The actual size can vary greatly, from many large muscle fibers in the quadriceps muscle group per motor unit to just a few muscle fibers in the muscles of the fingers per motor unit.
No, intrafusal fibers don't contract.
No. The heart muscle contracts in sections, first the top (atrium) then the bottom (ventricle). But when it is working properly, the heart muscle fibers contract together in large groups.
falso my friendo
This will depend upon the number of muscle fibers the nerve innervates. However, all fibers innervated by the nerve should contract in response to the neuronal impulse.
the motor unit
Muscle fibers are rich in ATP. All muscle fiber types are rich in ATP (having many mitochondria).
You have control over all striated skeletal muscles. You can not control smooth muscle fibers and cardiac muscle tissues.