Blood vessel diameter is regulated by all of the following EXCEPTÂ ________.
A. nitric oxide
B. endothelin
C. bradykinin
D. platelet-derived growth factor
Answer: D
Anatomy & Physiology
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All four heart valves are closed during this time.
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A. scapula B. humerus C. clavicle D. sternum
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Indicate whether the statement is true or false
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