How Do the Lymphatic and Immune Systems Contribute to Osteoporosis

Multiple Choice

How do the lymphatic and immune systems contribute to osteoporosis?

A) Macrophages in the skin destroy the precursor to vitamin D.
B) Immune cells resist infections and release chemicals that promote tissue repair.
C) Excessive smoking stimulate immune cells to attack bones, which increases bone loss.
D) Calcium ions are excreted by immune cells at the lymph nodes.
E) Decreased estrogen levels following a viral infection contribute to the disease.