Which of the following structures works like a camera shutter to adjust the amount of light entering ...

Which of the following structures works like a camera shutter to adjust the amount of light entering the eye?
 
  a. The sclera
  b. The iris
  c. The lens
  d. The posterior chamber

Question 2

When explaining the priorities of helmet removal to a candidate patroller, you would stress:
 
  a. sliding the helmet rearward off the head so that you don't hit the patient's nose.
  b. sliding the fingers under the occiput so that the head doesn't drop backward.
  c. applying a cervical collar before removing the helmet to help stabilize the head.
  d. removing the helmet to ensure the patient's proper alignment on a backboard.

Question 3

Which of the following findings indicates that a patient who received a blow to the head is suffering from something other than a concussion/TBI?
 
  a. He cannot remember what happened.
  b. He asks the same questions over and over.
  c. His heart rate is 92 and his blood pressure is 144/86.
  d. His pupils are noticeably unequal.