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IGCSE biology > The eye > Flashcards

The eye Flashcards

1
Q

Receptors

A

Group of specialized cells
They detect changes in environment
Simulate electrical impulse in response

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2
Q

Sense organ

A

Group of receptors that respond to specific stimuli

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3
Q

Eye

A

Contains receptors that are sensitive to light and colour

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4
Q

Rod cells

A

Sensitive to light

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5
Q

Cone cells

A

Sensitive to colour

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6
Q

Cornea

A

Transparent lens- REFRACTS LIGHT AS IT ENTERS THE EYE

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7
Q

RETINA

A

Contains light receptor cells

Rods & cones

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8
Q

Optic nerve

A

Sensory neurone that transports impluses from brain to eye

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9
Q

Iris

A

Controls amount of light entering the eye

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10
Q

Pupil

A

Hole allowing light to enter the eye

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11
Q

Lens

A

Transparent disc that can change shape to focus light on retina

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12
Q

Pupil reflex

A

Reflex action that is carried out TO PREVENT DAMAGE OF THE RETINA

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13
Q

IN DIM LIGHT… (pupil reflex)

A

The pupil DILATES(widens) to allow as much light into the eye as possible.

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14
Q

In BRIGHT LIGHT( pupil reflex)

A

Pupils CONSTRICT(narrows) to prevent too much light entering the eye and damaging the retina

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15
Q

In bright light

A

Circular muscles contract and radial muscles relax so less light enters eye

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16
Q

In dim light

A

Radial muscles contract and circular muscles relax so more light enters into the eye.

17
Q

Accommodation

A

Ways of fine focusing in lens

18
Q

For a near object

A

Ciliary muscles-contract
Suspensory ligaments- slacken
Lens becomes fatter
More light is refracted

19
Q

For far object

A

Ciliary muscles relax
Suspensory ligaments tighten
Lens becomes thinner
Less light is refracted

20
Q

Rods

A

Sensitive to dim light

21
Q

Cones

A

Sensitive to different colours of light

22
Q

3 types of cones

A

Red
blue
green

23
Q

Almost all cones are found in

A

fovea

24
Q

Rods are found all over

A

Retina

25
Q

Blind spot

A

Place where the optic nerve ATTACHES TO the retina BCS there are no light-sensitive cells there

IGCSE biology (3 decks)

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