MUSCLE PHYSIOLOGY

Detailed explanation-1: -Each motor neuron ending sits very close to a muscle fibre. Where they sit together is called a neuromuscular junction. The motor neurons release a chemical, which is picked up by the muscle fibre. This tells the muscle fibre to contract, which makes the muscles move.

Detailed explanation-2: -Motor neurons are covered with ion channels, which open in response to electrical signals from the brain. Once these ion channels are open, a series of cascading reactions allows the signal to reach the skeletal muscle cells, which ultimately results in muscle contraction.

Detailed explanation-3: -Motor neurons are known as multipolar neurons in terms of their structure. This means that they have a single axon and multiple dendrites. Motor neurons are the most common structure for neurons.

Detailed explanation-4: -Skeletal muscles comprise multiple individual muscle fibers that are stimulated by motor neurons stemming from the spinal cord. They are grouped together to form “motor units” and more than one type of muscle fiber can be present within each motor unit.

Detailed explanation-5: -The second type of lower motor neuron, called motor neurons, innervates the extrafusal muscle fibers, which are the striated muscle fibers that actually generate the forces needed for movement.