respiratory c's a series of nerve centers (the apneustic, pneumotaxic, and medullary respiratory centers) in the medulla and pons that coordinate respiratory movements. satiety center a group of cells in the ventromedial hypothalamus that when stimulated suppress the desire for food.. a point from which a process starts, especially a plexus or ganglion giving off nerves that control a function. 2. nerve center. 3. an agency or other site where services are offered to the public. accelerating center the vasomotor center in the brainstem involved in acceleration of heart action.
Noble Gases. The noble gases are the elements at the far right-hand column of the periodic table: helium, neon, argon, xenon, and radon. Because of the group they belong to, they each have a full valence shell or level. In the case of helium, a full valence shell has two electrons, and in the remaining noble gases, eight electrons make up a full valence shell.
Time-saving video on noble gases. The noble gases are located in the last column on the right side of the periodic table and are some of the most stable elements in the periodic table. Start Your Free Trial Who We Are