Final answer:
The intersection between the muscular system and the nervous system is the neuromuscular junction, where motor neurons release acetylcholine to initiate muscle contraction. Motor neurons are the correct choice, involved in transmitting signals to muscle fibers.
Step-by-step explanation:
The major intersection between the muscular system and the nervous system is found at the neuromuscular junction, where motor neurons connect to muscle fibers.
The correct answer to the student's question is d) "Motor neurons". This junction is where motor neuron axons form synapses with muscle fiber sarcolemmas, enabling muscle contraction. When a motor neuron fires, it releases acetylcholine into the synaptic cleft, which binds to receptors on the muscle cell and induces contraction. The strength and number of contracting fibers can vary based on the frequency of motor neuron impulses.
A nerve describes a bundle of axons in the peripheral nervous system, so the answer to question 12 would be d) "nerve".
The somatic nervous system controls the skeletal muscles, hence for question 9, the correct term is "somatic".
Statements in question 10 and 11 need clarification; sarcomeres are not cells but the fundamental units within muscle cells responsible for contraction, so the statement is False. It's also true that muscles contain connective tissue as well as muscle tissue.