Sense Organ

1.Why Do We Sneeze?

• When the hairs in the nose trap any dust or germs, the brain acts and commands our body to sneeze.
• This way, the body does not allow unwanted substances to enter our body through the respiratory passage.

2.Why Do We See the Spot in Our Eyes Constrict or Expand?

• The central part of our eye, which appears like a small black spot called the pupil, regulates the entry of light into the eyes.
• When the light is too dim, the pupil expands and constricts when it is too bright.