Biology Topic 8 5.0 / 5 based on 4 ratings ? BiologyGrey MatterA2/A-levelEdexcel Created by: lollipop111Created on: 17-02-16 13:14 10924735618 Across 1. What is the role of the conjunctiva? (8, 3, 6) 4. What are neurotransmitters contained in? (8, 8) 5. What is the role of the cornea? (5, 5) 7. What controls the size of the pupil? (3, 4) 8. What is the myelin sheath made up of? (7, 5) 10. What is the process of returning to the resting potential called? (14) Down 2. What is the name of the first neurotransmitter to have ever been discovered? (13) 3. What are plant photoreceptors called? (12) 6. What is the fatty insulating layer around the axon called? (6, 6) 9. Which of the two sets of muscles (radial and circular) cause the pupil to dilate? (6)
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