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Sam - Biology > The Senses > Flashcards

The Senses Flashcards

Ch 34

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1
Q

Benefits of carnivores eyes?

A
  • better judgement of distance
  • better focus on prey
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2
Q

Benefits of herbivores eyes?

A
  • wider field of vision
  • better detection of predators
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3
Q

Functions of conjunctiva?

A
  • protection against infections & irritants
  • moistens & lubricates
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4
Q

Function of sclera (sclerotic coat)

A

holds eye in shape

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5
Q

Function of cornea?

A

lets light into the eye,
and bends it towards the retina

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6
Q

Function of choroid?

A

ensures there’s no internal reflection of light inside the eye

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7
Q

How does choroid absorb light in the eye?

A

contains black pigment called melanin

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8
Q

How does choroid nourish the eye?

A

contains blood vessels

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9
Q

Where are light receptors (rods & cones) located?

A

retina

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10
Q

Are there more rods or cones?

A

rods

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11
Q

What do rods detect?

A

black and white (vision)

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12
Q

What do cones detect?

A

colour (vision)

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13
Q

What light do rods work in?

A

dim light

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14
Q

What light do cones work in?

A

bright light

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15
Q

Where are rods found?

A

all over retina

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16
Q

Where are cones found?

A

mostly at fovea

17
Q

Function of fovea?

A

images are focused/formed

18
Q

Is blind spot sensitive to light?

A

no

19
Q

Are there rods or cones or both in blind spot?

A

none

20
Q

What leave the blind spot through part of retina?

A

nerve fibres

21
Q

Nerve fibres leave through what in blind spot?

A

retina

22
Q

Function of optic nerve?

A

transmits impulses from the eye to the brain

23
Q

What happens if damage is done to optic nerve?

A

can’t transmit/no impulse

24
Q

Shape of lens?

A

curved

25
Q

Function of lens?

A

focus light on the retina

26
Q

What is accommodation (in ciliary muscle)?

A

the changing of shape of lens in a reflection action

27
Q

What is coloured part of the eye?

A

Iris

28
Q

What does iris control?

A

amount of light entering the eye

29
Q

Blue-eyed people have no what?

A

melanin

30
Q

When iris contracts, pupil…?

A

dilates

31
Q

When iris relaxes, pupil…?

A

constricts

32
Q

Opening of iris is called?

A

pupil

33
Q

What does pupil let into eye?

A

light

34
Q

Why is pupil black?

A

light normally emerges from the inside of eye

35
Q

3 reasons why having two eyes is good?

A
  • depth perception
  • increase visual field
  • 3D vision
36
Q

Function of aqueous humour?

A

holds front of eye in shape

37
Q

What is aqueous humour?

A

salt solution

38
Q

Function of vitreous humour?

A

gives shape to eye

39
Q

How is the eye moved?

A

by use of six external muscles

Sam - Biology (17 decks)

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