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Pearson Edexcel GCSE Triple Science Biology SB2 Flashcards
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What is short-sightedness, how is it caused, and how is it corrected?
What is short-sightedness, how is it caused, and how is it corrected?
When distant objects appear blurred, as light rays are focused in front of the retina.
This is caused by the eyeball being too short or the cornea being too curved.
Corrected with a converging lens
What is a reflex arc?
What is a reflex arc?
When a faster reaction is needed, so electrical impulses are sent straight to the spinal cord, skipping the brain
What is a PET scan?
What is a PET scan?
The patient is injected with radioactive glucose, which active cells in the brain will absorb more of and release gamma rays. The scanner detects these rays, showing which parts of the brain are active during different activities
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