具有A型性格的人,他们具有强烈追求成功的欲望,善于竞争,好胜心强,对任何事物存有戒心、总感到时间不够用。这种人脾气急躁。说起话来语气很强,做事情很不耐烦,易发火。这种人容易激动,经常或长期处于精神紧张状态之下。而与A型性格相反的,B型性格的人,一般就显得不那么容易发脾气,做事情慢条斯理,遇事从不着急,没有争强好胜的心理,无论做何事总表现出胸有成竹,不受外界干扰。成功时不过分兴高彩烈,失败时也不过分悲伤。显然B型性格的人不容易引起精神紧张。精神紧张时,交感神经兴奋,大量分泌肾上腺素和去甲肾上腺素。它们一方面可直接引起血压升高, A-type personality who have a strong desire for the pursuit of success, good at competition, ambitious, wary of anything, always feel that time is not enough. Such people temper temper. Talking very strong tone, doing things very impatient, easy to get angry. Such people are easily excited, often or long-term under stress. And the opposite of the type A personality, type B personality, the general is not so easy to lose his temper, doing things slowly, failing in no hurry, there is no contented psychology, no matter what the total performance of the best of its kind, from External interference. Succeed in success when the color is strong, failure is not too sad. Obviously B-type personality is not easy to cause mental stress. When nervous, sympathetic excitement, a large number of secretion of epinephrine and norepinephrine. On the one hand, they can directly cause high blood pressure,