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Below is an essay on "Miss" from Anti Essays, your source for research papers, essays, and term paper examples.

These questions are quite synoptic in their approach. They have been divided into separate sections although you will need to look at whole papers to see how they are synoptically organised.   There are a couple from other syllabuses to cover topics new to the specification.
The nervous system and nervous transmission (Text book pages 196-216)

Reflex Arcs

Unit 5 sample paper

Question 6
The retina of a mammal’s eye contains millions of receptor cells which are highly sensitive to light. These receptor cells are protected from excessively bright light by the iris.   The diagram below shows part of a nerve cell pathway involved in the reflex controlling the size of the pupil by the iris.

(a) (i) Put a cross in the box next to the arrow that correctly shows he direction of impulse 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 table below.

| Relay neurone | Motor neurone | Sensory neurone |
Cell A | | | |
Cell B | | | |

June 2005 Q4.

The graph below shows the effect of light intensity on the area of the pupil in the human eye.

(a) (i) Describe the effect of changing light intensity on the area of the pupil.
…………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………… (1)
(ii) Explain how the muscles in the eye bring about this change.
…………………………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………………(2)
(b) Change 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 still occurs in an unconscious person.
…………………………………………………………………………………………………………………………………………………...

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