HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
All the nerve fibres and muscle fibres in a single muscle bundle.
|
|
|
One muscle fibre and its single nerve fibre.
|
|
|
A single motor neuron and all the muscle fibres that it innervates.
|
|
|
As the neuron which carries the message from muscles to CNS.
|
Detailed explanation-1: -A single motor neuron, however, can innervate many muscle fibers. The combination of an individual motor neuron and all of the muscle fibers that it innervates is called a motor unit. The number of fibers innervated by a motor unit is called its innervation ratio.
Detailed explanation-2: -A motor unit consists of one alpha motor neuron and all the extrafusal muscle fibers it innervates. The number of these muscle fibers can vary from 1 or 2 to 1000. If the number of muscle fibers innervated by a motor neuron is few, the motion produced by that muscle is more precise.
Detailed explanation-3: -Motor unit is the functional segment of skeletal muscles. A motor unit contains two main components: a single different motor neuron (it is a neuron that carries signals away from the central nervous system) and all the muscle fibres. Motor unit is made up of a single neuron that makes a group of skeletal muscles.
Detailed explanation-4: -Medical Definition motor neuron. noun. : a neuron that passes from the central nervous system or a ganglion toward or to a muscle and conducts a nerve impulse that causes movement. called also motoneuron.
Detailed explanation-5: -The neuromuscular junction (NMJ) is a highly specialized synapse between a motor neuron nerve terminal and its muscle fiber that are responsible for converting electrical impulses generated by the motor neuron into electrical activity in the muscle fibers.