Red blood cells are produced in the body and travel through arteries and veins. The circulatory system is able to maintain a relatively constant amount of red blood cells because blood cells are regularly produced by
A. the lymph of the circulatory system
B. the neurons of the nervous system
C. the glands of the endocrine system
D. the bones of the skeletal system
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The human circulatory system and respiratory system work together to help the body maintain homeostasis. Which of the following is a result of the combined effort of these two systems?
A. the removal of salts
B. the removal of urine
C. the intake of carbon dioxide
D. the intake of oxygen
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