Hyperthyroidism is caused by increased levels of thyroxine in blood plasma. A client with this endocrine dysfunction would experience（）
A. heat intolerance and systolic hypertension.
B. weight gain and heat intolerance.
C. diastolic hypertension and widened pulse pressure.
D. anorexia and hyperexcitability.
参考答案：A
解析：
An increased metabolic rate in hyperthyroidism because of excess serum thyroxine leads to systolic hypertension and heat intolerance. Weight loss--not gain occurs due to the increased metabolic rate. Diastolic blood pressure decreases because of decreased peripheral resistance. Heat intolerance and widened pulse pressure do occur, but the other answers are incorrect. Clients with hyperthyroidism experience an increase in appetite--not anorexia.