Chapter 13 - Coordination and response 0.0 / 5 ? BiologyCoordination and responseIGCSECIE Created by: E456Created on: 20-03-17 14:28 What are changes in an organism's environment called? stimuli 1 of 18 Which system are hormones are part of? endocrine 2 of 18 What is the human nervous system made up of? neurones 3 of 18 What is the longest fibre in a neurone called? axon 4 of 18 What are the shorter fibres in a neurone called? dendrites 5 of 18 What is the pathway along which the nerve impulse passes called? reflex arc 6 of 18 What are the gaps between neurones called? synaptic clefts 7 of 18 What is a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter called? synapse 8 of 18 What is the part of the eye that contains the receptor cells? retina 9 of 18 What is the tough coat that protects the part of the eye inside the orbit called? sclera 10 of 18 What is the part of the retina where the receptor cells are packed most closely together called? fovea 11 of 18 What is the black layer behind the retina called? choroid 12 of 18 What is the circular piece of coloured tissue in front of the lens called? iris 13 of 18 What is the gap in the middle of the iris called? pupil 14 of 18 What is the adjustment in the shape of the lens, to focus light coming from different distances, called? accommodation 15 of 18 Where are hormones made? endocrine glands 16 of 18 What is a response in which a plant grows towards or away from gravity? gravitropism 17 of 18 What is a response in which a plant grows towards or away from the direction which light is coming? phototropism 18 of 18
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