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.
What is Past Perfect Tense? The past perfect tense is used when two actions take place in the past. We use the past perfect tense for the action which took place first and the simple past tense for the action which takes place next. Example 1: The bus left at 10.30 pm. (First action) We arrived at 10.40 pm. (Second action) When we arrived, the bus had left. Example 2: The classes started. (First action) we arrived at school. (Second action) Before we arrived at school the classes had started. How do we make the Past Perfect Tense?