Question

Action potentials travel the length of the axons of motor neurons to the axon terminals. these motor neurons __________. action potentials travel the length of the axons of motor neurons to the axon terminals. these motor neurons __________. extend from the spinal cord to the sarcolemma of a skeletal muscle fiber arise in the epimysium of a skeletal muscle and extend to individual skeletal muscle fibers extend from the brain or spinal cord to the sarcolemma of a skeletal muscle fiber extend from the brain to the sarcolemma of a skeletal muscle fiber

Answer 1

Motor neurons extend from the spinal cord to the sarcolemma of a skeletal muscle fiber and release acetylcholine at the neuromuscular junction to initiate muscle contraction.

Step-by-step explanation:

The motor neurons that extend from the spinal cord to the sarcolemma of a skeletal muscle fiber are responsible for initiating muscle contraction. These neurons are part of the somatic nervous system and play a crucial role in voluntary muscle movements.

An action potential travels along these motor neuron axons to the axon terminals, where it reaches the neuromuscular junction. Here, the neurotransmitter acetylcholine is released, binds to receptors on the sarcolemma, and triggers depolarization that leads to muscle contraction.

Answer 2

Action potential travel the length of the axon ............................... These motor neurons EXTENDS FROM THE BRAIN OR THE SPINAL CORD TO THE SARCOLEMMA OF A SKELETAL MUSCLE FIBER.