2. I) In experiment 1 the photo pupillary reflex contracts the smooth muscle of the iris to control the size of the pupil. When we cover our eyes to make it dark, our pupil expands in an attempt to allow more light in. When we are exposed back to the light our pupil then contracts to limit the amount of light getting in. Humans evolved this trait to increase vision in the dark.
II) The patellar reflex causes the knee to jerk in a monosynaptic reflex. It occurs so fast because there is only one synapse in the circuit needed to complete the reflex. Although after the squares were completed, the knee did not jerk because the muscles are tired and cannot react as fast. Humans evolved this reflex in order to react to danger immediately.
III) The blink reflex is something humans developed to keep things out of our eyes. The cotton ball, or anything coming at our eyes, causes us to blink without thinking to protect our eyes.
IV) For the fourth experiment we used the Plantar Reflex. When we drag the pen on our foot, our toes are supposed to curl. However, people suffering from MS and Newborns spread their toes instead because their nervous system isn't myelinated, resulting in Babinski's sign.
V) The last test doesn't measure a reflex, but rather your hand-eye coordination. Mine and John's were very similar, with my average time being 0.16 seconds and his being 0.18 seconds. A possible mistake we could have made in this experiment could have been holder the meter stick closer or further away from the hand, or perhaps miscalculation.
3. Texting significantly slowed down our reaction time. I went from an average of 0.16 seconds without texting to 0.30 seconds with seconds, nearly doubling my time! This gives us significant evidence to prove that texting while driving is very dangerous.
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