North Africa, region of Africa comprising the modern countries of Morocco, Algeria, Tunisia, and Libya. North AfricaEncyclopÃ¦dia Britannica, Inc.The geographic entity North Africa has no single accepted definition.
A Stressor is anything (physical or psychological) that produces stress (negative or positive) is considered a stressor.
depressor nerve. 1. a nerve that lessens the activity of an organ. 2. an afferent nerve whose stimulation causes a fall in blood pressure. efferent nerve any nerve that carries impulses from the central nervous system toward the periphery, such as a motor nerve.See also neuron.otor nerves, or efferent nerves, transmit impulses from the brain and spinal cord to the muscles. Mixed nerves are composed of both motor and sensory fibers, and transmit messages in both directions at once.