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IGCSE Biology > Sense Organs > Flashcards

Sense Organs Flashcards

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1
Q

Aqueous Humour

A

Watery fluid that fills the front Chamber of the eye

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2
Q

Conjunctiva

A

Thin Membrane protecting the cornea

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3
Q

Cornea

A

Transparent layer that refracts light

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4
Q

Pupil

A

Circular opening for directing light into lens

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5
Q

Iris

A

Controls the size of pupil

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6
Q

Ciliary Body

A

Contains circular muscles that alter the shape of the lens during focusing

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7
Q

Lens

A

Gel like structure that helps focus the image

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8
Q

Vitreous Humour

A

Jelly like fluid filling the rear chamber of the eye, maintains eye shape

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9
Q

Blind Spot

A

Lacking cones and Rods

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10
Q

Optic Nerve

A

Transmits Impulses to the brain

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11
Q

Fovea

A

Region of the retina containing only cones

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12
Q

Retina

A

Photosensitive layer containing rods and cones

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13
Q

Choroid

A

Pigmented layer which absorbs light and prevents internal reflection

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14
Q

Sclera

A

Tough white fibrous layer protecting the eyeball and allows for attachment to external muscles

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15
Q

Suspensory Ligaments

A

Ligaments that attach lens to ciliary body

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16
Q

Rods (3)

A
  • Found mainly in the peripheral parts of the retina
  • Very sensitive to light - Work well in darkness
  • Give info in Black and white
17
Q

Cones (3)

A
  • Found mainly packed together in the Fovea
  • Less sensitive to light - Work well in bright light
  • Three types of cones for 3 colours
18
Q

In bright light (3)

A

Circular Muscles - Contract
Radial Muscles - Relaxes
Pupil - Constricts

19
Q

In dim light (3)

A

Circular muscles - Relax
Radial Muscles - Contract
Pupil - Dilates

20
Q

When looking at a distant object (3)

A

Ciliary muscles - relax
Ligaments - Tight
Lens - Long and thin

21
Q

When looking at a close object (3)

A

Ciliary muscles - Contract
Ligaments - Slack
Lens - Short & Fat

IGCSE Biology (7 decks)

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