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
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Spermatids mature into sperm by the process of
A) spermiogenesis. B) meiosis II. C) spermatogenesis. D) cytokinesis. E) meiosis I.
If damaged or diseased, which part of the brain would make a person unable to control and regulate the rate of respiratory movements?
A) the cerebral peduncles of the mesencephalon B) the pneumotaxic center of the pons C) the vasomotor center of the medulla D) the olivary nucleus of the medulla oblongata E) the respiratory rhythmicity center of the medulla
The overall exchange of gases between the atmosphere, the blood, and the cells is called ____________________
Fill in the blank(s) with correct word
A molecule made of two or more different atoms bonded together is called a(n)
A. atom. B. isotope. C. compound. D. ion.