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Question 1 of 368
What is the primary function of the blood circulatory system in mammals?
A. To provide mechanical support and protect softer body parts.
B. To transport dissolved food substances from the intestines to tissue cells, oxygen from the lungs to tissue cells, hormones, and metabolic wastes.
C. To regulate body temperature and transport hormones.
D. To defend the body against infection and transport excess salts.