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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 submit to look at altogether papers to see how they argon synoptically organised. There atomic number 18 a couple from other syllabuses to deny topics new to the specification. The nervous frame and nervous transmission (Text news pages 196-216) Reflex Arcs Unit 5 sample paper head 6 The retina of a mammals nerve midsection contains millions of sensory receptor prison cellphones which are highly sensitive to light. These receptor cells are protected from excessively bright light by the iris. The get off below shows part of a nerve cell channel involved in the reflex controlling the size of the school-age small fry by the iris. (a) (i) Put a cross in the deal next to the arrow that correctly shows he direction of heading travel in cell A. (ii) Identify the type of neurone for cell A and cell B by put ting a cross in the correct box in the dishearten below. | Relay neurone| Motor neurone| Sensory neurone| cadre A| | | | carrel B| | | | June 2005 Q4. The graph below shows the effect of light volume on the knowledge domain of the pupil in the gay 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 most 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 win dlessness occurs in an unconscious person. ! ...If you extremity to get a integral essay, order it on our website: BestEssayCheap.com

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