Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. The iris contains two groups of smooth muscles; a circular group called the sphincter pupillae, and a radial group called the dilator pupillae.
Jalapeno peppers are used to flavour chilli The ingredient which makes jalapeno peppers hot also makes prostate cancer cells commit suicide, a study suggests.
How chemotherapy kills cancer cells. Chemotherapy kills cells that are in the process of splitting into 2 new cells. This is how normal body tissues grow. But cancer cells divide much more often than normal cells, so they are more likely to be killed by chemotherapy.