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GCSE flashcards > b5a- homeostasis and response: nervous control side two > Flashcards

b5a- homeostasis and response: nervous control side two Flashcards

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1
Q

What is the function of the cerebral cortex? (2)

A

Largest part of human brain
Higher thinking skills

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2
Q

What is the function of the cerebellum?

A

Balance and voluntary muscle function

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3
Q

What is the function of the medulla?

A

Involuntary ( automatic) body functions

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4
Q

What is the function of the retina?

A

light sensitive cell layer

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5
Q

What is the function of the optic nerve?

A

Carries impulse to brain

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6
Q

What is the function of the sclera?

A

Protects the eye

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7
Q

What is the function of the cornea?

A

Transparent layer that covers pupil and iris

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8
Q

What is the function of the iris?

A

Pigmented layer that controls size of pupil

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9
Q

What is the function of the cilliary muscles?

A

Controls thickness of lens

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10
Q

What is the function of the suspensory ligaments?

A

Connects lens to ciliary muscles

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11
Q

What can the eye do to change the amount of light entering it?

A

Circular muscles and radial muscles in the iris can contract and relax to alter the size of the pupil to change the amount of light entering the eye

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12
Q

What happens if bright light hits the eye? (3)

A

Circular muscles contract
Radial muscles relax
Pupil constricts

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13
Q

What happens if dim light hits the eyes? (3)

A

Circular muscles relax
Radial muscles contract
Pupils dilate

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14
Q

What is myopia and how can it be treated? (3)

A

Short sightedness
Light is focused in the front of the retina
Treated using concave lens so light is focused on the retina

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15
Q

What is hyperopia and how can we treat it? (3)

A

Long sightedness
Light is focused behind retina
Treated by using convex lens so light is focused on retina

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16
Q

What is accommodation?

A

Process of changing the shape of the lens to focus on near or distant objects

17
Q

What happens if the eye focuses on a near object? (4)

A

Ciliary muscles contract
Suspensory ligaments loosen
Lens gets thicker
Light is more refracted

18
Q

What happens if the eye focuses on a distant object?

A

Ciliary muscles relax
suspensory ligaments tighten
lens pulled thin
light only slightly refracted

GCSE flashcards (53 decks)

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