The elimination of waste materials such as carbon dioxide from muscles causes blood capillaries to dilate as we exercise. thus, option B is correct.
What are blood vessels?
Blood vessels are the conduits that transport blood throughout the body. They form a closed loop that begins and ends at your heart, much like a circuit.
Increased blood flow arises from dilated blood vessels, and increased blood flow leads to more oxygen being delivered to the body's muscles and cells during activity.
As a result, higher blood flow is required to remove waste products such as carbon dioxide and lactic acid produced during exercise, as well as to transport the optimum quantity of oxygen to muscles in order for them to operate properly.
Learn more about blood vessels here:
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