5.2 The human nervous system

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Question 6
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A surgeon is performing a delicate microsurgery. They are looking closely through a surgical microscope to inspect a tissue specimen. They then lift their head to look at a digital monitor located on the far wall of the operating theatre to check the patient's heart rate.

a.

What is the physiological term for the process by which the eye adjusts its lens shape to focus on objects at different distances?

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b.

When the surgeon shifts their focus from the near tissue specimen to the distant wall monitor, how does the eye adjust to ensure the light rays are focused precisely onto the retina? Select from:

  • A: The ciliary muscles contract, the suspensory ligaments slacken, the lens becomes thicker, and light rays are refracted more.
  • B: The ciliary muscles relax, the suspensory ligaments tighten, the lens becomes thinner, and light rays are refracted less.
  • C: The ciliary muscles contract, the suspensory ligaments tighten, the lens becomes thinner, and light rays are refracted more.
  • D: The ciliary muscles relax, the suspensory ligaments slacken, the lens becomes thicker, and light rays are refracted less.
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c.

Suppose the surgeon has a vision defect where they can see the close-up tissue specimen perfectly clearly, but the distant wall monitor appears blurry. What is the medical name for this vision defect?

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5.2 The human nervous system Questions

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