Chapter 12 - Coordination and Response : Human Eye

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Cones

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18 Terms

1

Cones

enable us to see colours in bright light.

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2

Rods

enable us to see in dim light but only in black and white.

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3

Tear gland

Secretes tears which lubricate the eye, nourish the cornea and keeps it free from dust.

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4

Eye lashes

Shield eyes from dust particles.

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5

Iris

Contain radial and circular muscles that control the size of pupil

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6

Pupil

Allows light to enter the eye

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7

conjunctiva

Thin, transparent mucous membrane that covers the sclera

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8

Cornea

Transparent refractive layer covering the iris and pupil.

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9

Choroid

Middle layer of the eyeball, between the sclera and retina.

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10

Retina

Innermost layer of the eyeball which contains photoreceptors, which are connected to the optic nerve.

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11

Lens

Transparent biconvex structure that refracts light onto the retina.

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12

Fovea

Also called yellow spot, a small depression in the retina where images are usually focused

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13

Suspensory ligaments

Connects the ciliary body to the lens

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14

Optic nerve

Transmits signal from the retina to the brain.

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15

Photoreceptors

consist of rods and cones.

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16

Vitamin A

The vitamin required for the formation of visual purple

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17

Accommodation

A reflex action where the lens is adjusted so that clear images of objects at different distances are formed on the retina.

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18

Pupil reflex

Reflex action (involuntary) where the pupil changes size in response to changes in light intensity.

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