Pupil reflex

This is the work Tomas Braun and I did in the last Biology class

Use a torch to focus on a companion’s eye.

Write down your observations with bright kight and dim light.

Search a video which explains the pupil reflex.

Complete the following chart.

Observations: when the eye was closed, no light could enter to it. Therefore, the pupil dilated. However, when it was exposed to the light of the torch, the pupil constricted, to regulate the amount of light that enters to

Flow Diagram in bright light:

  • Stimulus: Light
  • Receptor: Cones
  • Coordinator: Brain
  • Effector: Muscles of the iris
  • Effect: Circular muscles contract and radial muscles relax
  • Response: Pupil constricts

Flow diagram in dim light:

  • Stimulus: Dim light
  • Receptor: Rods
  • Coordinator: Brain
  • Effector: Muscles of the iris
  • Effect: Circular muscles relax and radial muscles contract
  • Response: Pupil dilates

 

Video:

https://youtu.be/WwB2jyj2lYM