1. a sudden involuntary contraction of a muscle or group of muscles. 2. a sudden, transitory constriction of a passage, canal, or orifice; spasms usually occur when the nerves supplying muscles are irritated, and are often accompanied by pain. A vasospasm is a rare type that occurs in a blood vessel.
Effected means executed, produced, or brought about. For example, The dictatorial regime quickly effected changes to the constitution that restricted the freedom of the people. On the other hand, affected means made an impact on. It is the past tense of the verb form of affect, which means to impact.
influence. 1. used as a noun. You use influence as a noun to refer to the power that someone or something has to affect people's behaviour or decisions. His wife had a lot of influence. His teachings still exert a strong influence. If you want to mention the person or thing affected, you use on.