Explain the pupil reflex, limited to changes in light intensity and pupil diameter
1 Answer Describe the function of each part of the eye, limited to: (a) cornea – refracts light (b) iris – controls how much light enters the pupil (c) lens – focuses light on to the retina (d) retina – contains light receptors, some sensitive to light of different colours (e) optic nerve – carries impulses to … Read more
1 Answer Identify in diagrams and images the structures of the eye, limited to: cornea, iris, pupil, lens, retina, optic nerve and blind spot
1 Answer Describe sense organs as groups of receptor cells responding to specific stimuli: light, sound, touch, temperature and chemicals
1 Answer State that synapses ensure that impulses travel in one direction only
1 Answer Describe the events at a synapse as: (a) an impulse stimulates the release of neurotransmitter molecules from vesicles into the synaptic gap (b) the neurotransmitter molecules diffuse across the gap (c) neurotransmitter molecules bind with receptor proteins on the next neurone (d) an impulse is then stimulated in the next neurone
1 Answer Describe the structure of a synapse, including the presence of vesicles containing neurotransmitter molecules, the synaptic gap and receptor proteins
1 Answer Describe a synapse as a junction between two neurones
1 Answer Describe a reflex action as a means of automatically and rapidly integrating and coordinating stimuli with the responses of effectors (muscles and glands)
1 Answer Describe a simple reflex arc in terms of: receptor, sensory neurone, relay neurone, motor neurone and effector
1 Answer
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