Laughter appears to cause the tissue that forms the inner lining of blood vessels called the endothelium, to dilate or expand in order to increase blood flow. Laughter offsets the impact of mental stress which is harmful to the endothelium. A compound called nitric oxide is known to play a role in the dilation of the endothelium. Mental stress may lead to a breakdown in nitric oxide that results in blood vessel constriction. Hence laughing often is a great adjunct besides proper diet and regular exercise for improving blood vessel health and for relieving mental stress.
- Courtesy of Arun's blog.
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