Jill, a 35-year-old mother of 3, was diagnosed with breast cancer and underwent a radical mastectomy of her right breast which involved removal of several axial lymph nodes. Following the surgery, Jill noticed that her right arm would swell whenever she experienced a minor cut or wore t-shirts with restrictive sleeves Why were the lymph nodes removed? Explain what has caused Jill’s arm to swell. In doing so, please describe the general structure and homeostatic importance of the body system that is involved.