The Eye and Nervous System Questions Essay Sample

Item 1 refers to the undermentioned diagram of a longitudinal subdivision through the human oculus

1. At what point is vision non possible?
( A ) I
( B ) II
( C ) III
( D ) IV



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Item 2 refers to the undermentioned diagrams ( I and II ) stand foring the flag in bright and subdued visible radiation severally.

2. What causes the visual aspect in I and II to be different?
( A ) In bright and dim light the round and radial musculuss both contract. ( B ) In bright and dim light both round and radial musculuss relax. ( C ) In dim light the round musculuss relax and radial musculuss contract. and in bright light radial musculuss relax and round musculuss contract. ( D ) In bright visible radiation the round musculuss relax and radial musculuss contract. and in dimt light radial musculuss relax and round musculuss contract.

Item 3 refers to the undermentioned information.
Three people labeled I to III. EACH have different oculus defects ( s ) as stated below
I. Long orb
II Short orb. normal cornea and lens
III Normal orb. cataract



3. Which of the people can see distant objects without disciplinary lenses? ( A ) I merely
( B ) II merely
( C ) I and II merely
( D ) II and III merely


4. Which of the undermentioned types of lens will rectify short eyesight?

5. Which of the undermentioned parts of the oculus maps as a receptor? ( A ) Iris
( B ) Lens
( C ) Retina
( D ) Optic nervus


6. The oculus is sometimes referred to as an effecter organ because ( A ) the student constricts in the presence of bright visible radiation
( B ) the rods and cones are stimulated by visible radiation
( C ) images which autumn on the retina are sent to the encephalon
( D ) nerve cells from the oculus lead to the cardinal nervous system


Item 7 refers to the undermentioned diagram of the oculus.

7. Which of the labelled parts contains cells called rods and cones? ( A ) I
( B ) II
( C ) III
( D ) IV


8. Andrea leaves a brilliantly illuminated country and ventures into a dark cupboard. Which of the undermentioned alterations occur in the oculus? ( A ) Radial musculuss of the flag contract and pupils become larger ( B ) Circular musculuss of the flag contract and the pupils addition in size ( C ) Pupils lessening in size because the radial musculuss in the flag relax ( D ) Pupils lessening in size due to the contraction of the round musculuss of the flag.

Nervous System

1. Which of the undermentioned diagrams right represents the tract of the transmittal of an urge for a spinal physiological reaction?

Item 2-3 refer to the undermentioned diagram
2. When the tegument of the manus touches a hot object. the sequence of urges flow from ( A ) I II III
( B ) II III I
( C ) II I III
( D ) I III II



3. The numbered constructions
I IIIII
( A ) receptor effecter relay neurone
( B ) receptor relay neurone effecter
( C ) effecter relay neurone receptor
( D ) effecter receptor relay neurone




4. Which of the followers is NOT involved in the automatic action of the organic structure known as the knee-jerk reaction? ( A ) Spinal cord
( B ) Motor neurone
( C ) Sensory neurone
( D ) Brain


5. Which of the followers is NOT a distinguishing characteristic of the nervous system?

( A ) Rapid response
( B ) Localised reaction
( C ) Long- permanent consequence
( D ) Temporary and reversible response


6. When person sees appetizing nutrient. spit is frequently produced. Which of the followers is the right sequence for this automatic action?

( A ) Receptor organ spinal cord encephalon
( B ) Receptor organ salivary secretory organ encephalon
( C ) Receptor organ encephalon spinal cord
( D ) Receptor organ spinal cord salivary secretory organ


7. Which construction of the encephalon is responsible for the ordinance of H2O content in the blood? ( A ) Cerebrum
( B ) Cerebellum
( C ) Hypothalamus
( D ) Pituitary secretory organ


8. The long procedure of nervus cell which conducts impulses toward a cell organic structure is called ( A ) axon
( B ) dendron
( C ) ganglia
( D ) dendrites


9. What is the right way of travel for an urge from the receptor to the effecter in a automatic action? ( A ) Axon-sensory neurone-intermediate neurone- motor neurone- axon ( B ) Axon- motor neurone -intermediate neurone- sensory neurone – dendron ( C ) Dendron- motor neurone-intermediate neurone -sensory neurone – axon ( D ) Dendron -sensory neurone-intermediate neurone- motor neurone- axon

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