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英语句子成分分析Laughter does produce short-term changes in the func

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英语句子成分分析
Laughter does produce short-term changes in the function of the heart and its blood vessels,boosting heart rate and oxygen consumption.
为什么laughter后面是does produce?有什么作用?是不是可以直接说produces?
逗号后面是什么成分?
英语句子成分分析Laughter does produce short-term changes in the func
does 在这里做强调的意思
例句
you did have really a good temper!
你脾气真不错
这里的did就是强调一下 “have”这个动词
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