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Year 11 TS - Biology > B10 - The Nervous System > Flashcards

B10 - The Nervous System Flashcards

1
Q

What is the Function of the Retina?

A

Controls the light receptor cells that detect Light Intensity and Colour

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2
Q

What is the Function of the Optic Nerve?

A

Sensory Neurone that carries electrical signals from the Eye to the Brain

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3
Q

What is the Function of the Cornea?

A

Transparent covering at the Front of the eye that Bends Light

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4
Q

What is the Function of the Sclera?

A

White layer of the eye that covers the Eyeball

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5
Q

What is the Function of the Iris

A

Controls how much Light enters the Pupil

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6
Q

What is the Function of the Ciliary Muscles?

A

Ring of muscles around Lens which Relaxes and Contracts to change the shape of it.

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7
Q

What is the Function of the Suspensory Ligaments?

A

Works with the Ciliary Muscles to change the shape of the Lens

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8
Q

What is the Function of the Lens

A

Transparent disc that changes shape to Focus Light into the Retina

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9
Q

What happens to the Eye in Dim Light?

A

Radial Muscles Contract

Circular Muscles Relax

Pupil becomes Dilated (wider)

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10
Q

What happens to the Eye in Bright Light?

A

Radial Muscles Relax

Circular Muscles Contract

Pupil becomes Constricted (narrower)

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11
Q

Why do Pupils Dilate in Dim Light?

A

So that more Light enters the Eye so that we can see better in Dark

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12
Q

Why do Pupils Constrict in Bright Light?

A

So that Less Light enters the Eye, preventing damage to the Retina

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13
Q

What is Accomodation?

A

Process of Changing the Shape of the Lens to focus on near or distant objects

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14
Q

What happens when you Focus on a Near Object?

A

Ciliary Muscles Contract

Suspensory Ligaments Loosen

Lens becomes Thicker and Refracts light rays Stronger

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15
Q

What happens when you Focus on a Distant Object?

A

Ciliary Muscles Relax

Suspensory Ligaments Tighten

Lens becomes Thinner and Refracts light rays Less

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16
Q

What are the Common Defects of the Eye?

A

Myopia (short-sightedness)

Hyperopia (long-sightedness)

17
Q

How is Myopia and Hyperopia treated?

A

treated with Spectacle Lenses (Glasses) which Refract Light Rays so they focus on Retina

18
Q

What type of Lens is used to correct Myopia?

A

Concave Lens

19
Q

What type of Lens is used to treat Hyperopia

A

Convex Lens

Year 11 TS - Biology (18 decks)

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