Miss

These questions atomic number 18 quite synoptic in their approach. They have been change integrity into separate sections although you will need to look at altogether papers to see how they are synoptically organised. There are a couple from other syllabuses to cover topics new to the specification.
The nervous frame and nervous transmission (Text book pages 196-216)

Reflex Arcs

Unit 5 sample paper

Question 6
The retina of a mammals nerve center contains millions of receptor cellphones which are highly sensitive to light. These receptor cells are protected from excessively bright light by the iris. The draw below shows part of a nerve cell alley involved in the reflex controlling the size of the school-age child by the iris.

(a) (i) Put a cross in the cut 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 correct box in the evade below.

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

June 2005 Q4.

The graph below shows the effect of light brashness on the knowledge domain of the pupil in the human 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 about 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 still occurs in an unconscious person.
…………………………………………………………………………………………………………………………………………………...If you extremity to get a full essay, order it on our website: Orderessay



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