Irregular and Unpredictable Vasoconstriction in the Fingertips and Toes (Such

question 62

Multiple Choice

Irregular and unpredictable vasoconstriction in the fingertips and toes (such as occurs in Raynaud's syndrome) would most likely be caused by

• A)insufficient vasomotor responses by the sympathetic nervous system.
• B)irregular and unpredictable responses by the parasympathetic division.
• C)both local and systemic defects in sympathetic response controlling muscle tone in vessel walls.
• D)defective control of blood pressure by both the sympathetic and parasympathetic divisions.
• E)None of the answers are correct.