How do the lymphatic and immune systems contribute to osteoporosis?

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


Answer: A

Anatomy & Physiology

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