求一篇高二英语作文！！！

人们常说：“笑一笑，十年少”。可见下对人的身体是很有好处的。请根据下列信息，以The Advantages of Laughter为题用英语写一篇短文，谈谈笑的好处。

1在身体上
下能增加肺的呼吸功能，使肌肉放松，增加血液循环，延长寿命等
2在精神上，笑可以消除紧张，驱散愁闷；有助于克服胆怯；抒发健康的情感等
3其他。。。。。

注意：1可适当增加细节，以使行文连贯；2词数：150左右

Laughter is good for the respiratory system

Respiratory problems such as asthma, bronchitis and frequent head colds are warded off easier by frequent laughter as it increases the concentration of immunoglobulin A in saliva. Laughter is good for the lungs overall as it provides an aerobic workout for the diaphragm. Laughter empties the lungs of more air than they take in which results in a cleansing effect in much the same way that an act of deep breathing does. This yields excellent therapeutic benefits for people who suffer from emphysema and sinus problems.
Laughter relaxes all muscles in the body

Muscles throughout the body need a break just like any other part. They often work overtime. When an individual gives in to a wholehearted laugh, muscles are given the opportunity to take a breather from work. Any muscle that does not take part in the laugh is able to relax fully at this time. But the muscles used in the laugh are also able to relax, just a short time later, after the laughter subsides. So in other words you are allowing for a complete relaxation of every muscle in your body when you laugh and mean it!

Reduction in stress hormones

There are a number of neuroendocrine hormones in the body that are activated when the body is under a great deal of stress. These hormones cause blood vessels to constrict in response to the stress as well as begin to suppress the activity of the immune system. Laughter plays a role in reducing at least four of these stress hormones. They include cortisol, dopac, epinephrine and growth hormone.

Control of pain

Laughter plays a tremendous role in controlling pain as well as the fact that it raises the level of certain brain chemicals, in particular that of endorphins (as previously mentioned these are the body’s natural painkillers). Another important role laughter plays is in the decrease of dopamine levels. Dopamine is a part of the “fight or flight response” of the body and is connected to the elevation of blood pressure when danger is perceived to be imminent