The diaphragm helps in the flow of the air to and from the lungs. The diaphragm moves down as one inhales, and then up as one exhales. The movement is controlled by the phrenic nerves. Whenever there is irritation on these nerves, it induces diaphragm spasm.
Titanium dioxide is used as a UV filter in sunscreen products to protect the skin from harmful UV rays when exposed to sunlight.
In the first round of testing, they measured the effects of the artificial light on skin that was free of any cosmetic products. In the second round, they looked at the impact on skin that had been exposed to Titanium Dioxide, or Ti02, a common ingredient in personal-care products.