The answer is body's line of defense. The first line of defense which includes physical as well as chemical barriers would defend the body from infection. It would include the tears, cilia, stomach acid,urine, white blood cells,mucus and the skin. The skin is the largest organ and would act as a barrier from pathogens. If first line of defense won't work the second line will then be activated.
shawna should not eat more calories if she lead an inactive lifestyle.
Concern goes beyond empathy, in that one does not simply care about another's need but also "depends" on them
They are part of the human brain.
I don't think there is a difference