MUSCLE PHYSIOLOGY

Detailed explanation-1: -Skeletal muscle contraction is voluntary and under the regulation of the somatic nervous system. Each skeletal muscle cell is innervated by a motoneuron, and each muscle fiber behaves as a single unit. Smooth muscle, on the other hand, is involuntary and under the regulation of the autonomic nervous system.

Detailed explanation-2: -The sympathetic nervous system regulates skeletal muscle motor innervation and acetylcholine receptor stability.

Detailed explanation-3: -In the somatic nervous system, acetylcholine is used at the neuromuscular junctions, triggering the firing of motor neurons and affecting voluntary movements.

Detailed explanation-4: -The somatic nervous system consists of both afferent (sensory) and efferent (motor) nerves [1]. It is also responsible for the reflex arc, which involves the use of interneurons to perform reflexive actions. Besides these, there are thousands of other association nerves in the body.

Detailed explanation-5: -Motor neurons within the SNS, also known as efferent neurons, carry motor information from the CNS to muscle fibers throughout the body. These types of neurons transmit signals from the spinal cord and brainstem to skeletal and smooth muscle to either directly or indirectly control muscle movements.