These questions atomic number 18 quite synoptic in their approach. They have been change integrity into separate sections although you will invite to look at altogether papers to see how they be synoptically organised. There atomic number 18 a couple from other syllabuses to peak topics new to the specification. The nervous frame and nervous transmission (Text hold back pages 196-216) Reflex Arcs Unit 5 sample paper enquiry 6 The retina of a mammals nerve centralise contains millions of sensory receptor cadrephones which are highly sensitive to light. These receptor cells are protected from excessively bright light by the iris. The gasp below shows part of a nerve cell alleyway involved in the reflex controlling the size of the school-age fry by the iris. (a) (i) Put a cross in the constrict next to the arrow that correctly shows he direction of drift travel in cell A. (ii) Identify the type of neurone for cell A and cell B by putting a cross in the correct box in the defer below. | Relay neurone| Motor neurone| Sensory neurone| cadre A| | | | carrel B| | | | June 2005 Q4. The graph below shows the effect of light intensity on the knowledge domain of the pupil in the forgiving eye. (a) (i) mark the effect of changing light intensity on the area of the pupil. (1) (ii) Explain how the muscles in the eye bring or so this change.
(2) (b) change over in area of the pupil is controlled by a reflex action. In this pupil reflex, name (i) the receptor the effector (1) (ii) Explain why the pupil reflex relieve occ urs in an unconscious person. ...If you ex! tremity to get a sufficient essay, order it on our website:
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