Final answer:
A neuromuscular reaction to abnormal electrical activity in the brain that results in sustained muscle contraction is identified as b) Tetanus.
Step-by-step explanation:
A neuromuscular reaction to abnormal electrical activity in the brain is referred to as (b) Tetanus.
This occurs when the frequency of action potentials or nerve impulses sent from a motor neuron is so high that they no longer allow for a relaxation phase in muscle fibers, resulting in sustained contraction. Muscle contraction is a sophisticated process controlled by the nervous system and involves the increase in the tension or decrease in the length of a muscle. It is initiated by the neurotransmitter acetylcholine at the neuromuscular junction, triggering an action potential that travels along the muscle fiber's membrane and leads to calcium release from storage. This release enables the cross-bridging of myosin heads with actin-binding sites, powered by ATP, resulting in the sliding of thin filaments by thick filaments and ultimately, muscle shortening to produce movement.