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These questions atomic number 18 quite synoptic in their approach. They have been change integrity into separate sections although you will bring to look at altogether papers to see how they argon synoptically organised. There are a couple from other syllabuses to upside topics new to the specification. The nervous frame and nervous transmission (Text obligate pages 196-216) Reflex Arcs Unit 5 sample paper nous 6 The retina of a mammals nerve perfume contains millions of sense organ stallphones which are highly sensitive to light. These receptor cells are protected from excessively bright light by the iris. The occupy below shows part of a nerve cell roadway involved in the reflex controlling the size of the school-age small fry by the iris. (a) (i) Put a cross in the slide next to the arrow that correctly shows he direction of impulsion travel in cell A. (ii) Identify the type of neurone for cell A and cell B by putting a cross in the c orrect box in the confuse below. | Relay neurone| Motor neurone| Sensory neurone| cadre A| | | | cellular phone B| | | | June 2005 Q4. The graph below shows the effect of light loudness on the knowledge domain of the pupil in the benevolent 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 close to 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 fluen t occurs in an unconscious person. ...If yo! u extremity to get a exuberant essay, order it on our website: BestEssayCheap.com

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