13. Blood flows faster in a venule than in a capillary because venules a. have one-way valves. b. are more muscular. c. are closer to the heart. d. have higher blood pressures. e. have larger diameters

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A: a. The 2nd heart sound is heard

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A: The heart is derived from the mesoderm. It is present in the thoracic cavity.

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Q: #7.

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