Which of the following involves respiratory system activity that contributes to osteoporosis?
A. Mucosal cells of the respiratory tract release chemicals that inhibit tissue repair.
B. Excessive smoking lowers estrogen levels, which increases bone loss.
C. Calcium ions released from the bones are excreted through exhaled air.
D. Lack of oxygen reduces vitamin D production and decreases calcium absorption.
E. Decreased oxygen levels contribute to the disease.
Answer: B
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a. True b. False Indicate whether the statement is true or false
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renal corpuscle nephron loop proximal convoluted tubule distal convoluted tubule