Junction between a motor neuron and a skeletal muscle fiber 1) sarcoplasmic reticulum 2) junction 3) motor end plate 4) axon terminal

Junction.

Explanation:

Junction or neuromuscular junction may be defined as a type of chemical synapse and the site where motor neuron transmit information to the muscle fibers and causes the muscle contraction.

The junction is formed by the contact between the skeletal muscle fibre and motor neuron. The mutation in neuromuscular junction may cause autosomal disorders in an individual.

Hence, the correct answer is option (2).