Please include/ build ideas off the following text: “Immune system functioning The system is also highly responsive to psychological stress and depression (Hawkley & Cacioppo, 2004). College students, for example, show lower levels of one variety of T cells (“natural killer” T cells) during exam periods than at other times (Glaser et al., 1992). And adults who have recently been widowed show a sharp drop in immune system functioning (Irwin & Pike, 1993). Chronic stress too, has an effect on the immune system, stimulating an initial increase in immune efficiency, followed by a drop (Hawkley & Cacioppo, 2004). Collectively, this research points to the possibility that life experiences that demand high levels of change or adaptation will affect immune system functioning. Over a period of years and many stresses, the immune system may become less and less efficient. It may well be that the immune system changes with age in basic ways regardless of the level of stress. But it is also possible that what is thought of as normal aging of the immune system is a response to cumulative stress.” Cite: “names of editors”, Physical and Cognitive Development in Early Adulthood. In Lifespan Development (7th ed., pp. 327-328). Pearson Education, Inc.