Nerve impulse. Definition. noun. (1) The movement of action potential along a nerve fiber in response to a stimulus (such as touch, pain, heat or cold). (2) The relaying of a coded signal that travels along a nerve cell membrane to an effector, such as muscle, gland or another nerve cell.Supplement. A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus.It is the means by which a nerve cell communicates with another cell.or instance, in neuromuscular junction, the nerve impulse moves along the axon of a nerve cell to instruct a muscle cell to contract. Word origin: nerve + impulse. See also: action potential. Please contribute to this project, if you have more information about this term feel free to edit this page.
Past Tense. Definition of Past Tense. In grammar, past tense refers to a verb-tense combination whose sole purpose is to state an action to have happened in the time that has passed. It is second to present tense, in which the action takes place in the present moment. A sentence in past tense always uses the second form of verb.
Verbs come in three tenses: past, present, and future. The past is used to describe things that have already happened (e.g., earlier in the day,â¦ Use this quick guide to learn how to use all tenses of a verb properly, including present perfect, past continuous, future perfect continuous, and more.