The smaller branches of the arterial tree that contain a muscular layer that enables changes in vessel diameter are called _______; these vessels ________
a. resistance vessels; enable the body to control how much blood is directed toward an area based on that area's metabolic needs
b. distributive vessels; sense oxygen levels and increase heart rate when the brainstem detects dropping O2 levels or rising CO2 levels
c. arterioles; exchange O2 and CO2 and rid the body of waste products
d. metabolic vessels; trigger the release of glucose into the circulatory system
Answer: a
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