Pupil Reflex-Oliverio Llobet and Francisco Montoya


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.

Observation: When exposing the eye to bright light the pupil constricts. On the other hand, when exposed to dim light the pupil dilates.

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

 

This is the video we chose.