Irregular and unpredictable vasoconstriction in the fingertips and toes (such as occurs in Raynaud's syndrome) would most likely be caused by
A) both local and systemic defects in sympathetic response controlling muscle tone in vessel walls.
B) insufficient vasomotor responses by the sympathetic nervous system.
C) defective control of blood pressure by both the sympathetic and parasympathetic divisions.
D) irregular and unpredictable responses by the parasympathetic division.
E) None of the answers are correct.
A) both local and systemic defects in sympathetic response controlling muscle tone in vessel walls.
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Answer the following statement true (T) or false (F)
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