The respiratory system branches like the circulatory. Oxygen and carbon dioxide diffuse between the end of these branches and the bloodstream. What are the ends of those branches called?
What is the purpose of the sphincters where the arterioles branch into the capillary beds?
A. To slow down blood flow so the capillaries don't burst under pressure
B. To block blood from coming back out of the capillary bed too quickly to allow for more complete diffusion of oxygen
C. To control blood flow to different areas of the body depending on activities
D. To speed up blood flow into the capillary bed for faster oxygen exchange
E. They remove carbon dioxide from blood passing through.
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