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Chapter 14 Animal Receptor Organs
1.
The Human Eye
Chapter 14
2.
3.
4.
14.2 The
Human Eye Upper eyelid pupil cornea Lower eyelid iris Conjunctiva (covers sclera) Tear gland eyelashes
5.
6.
7.
8.
Chapter 14 The
Human Eye Structure and Function of the Eye (Concept Map) January 11, 2010
9.
Vertical Section of
The Human Eye January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd.
10.
Vertical Section of
The Human Eye Attaches lens to ciliary body January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. suspensory ligament
11.
Vertical Section of
The Human Eye Controls amount of light entering the eye January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. iris suspensory ligament
12.
Vertical Section of
The Human Eye Refracts light rays; keeps eyeball firm January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. aqueous humour iris suspensory ligament
13.
Vertical Section of
The Human Eye Allows light to enter the eye January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. pupil aqueous humour iris suspensory ligament
14.
Vertical Section of
The Human Eye Refracts light rays into pupil January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. cornea pupil aqueous humour iris suspensory ligament
15.
Vertical Section of
The Human Eye lens Focuses light rays onto retina January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. cornea pupil aqueous humour iris suspensory ligament
16.
Vertical Section of
The Human Eye ciliary body Contains ciliary muscles which control curvature or thickness of the lens January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. lens cornea pupil aqueous humour iris suspensory ligament
17.
Vertical Section of
The Human Eye viterous humour Refracts light rays; keeps eyeball firm January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. ciliary body lens cornea pupil aqueous humour iris suspensory ligament
18.
Vertical Section of
The Human Eye Controls movement of eyeball January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament rectus muscles
19.
Vertical Section of
The Human Eye Protects against mechanical injury January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament sclera rectus muscles
20.
Vertical Section of
The Human Eye Pigmented black to prevent internal reflection of light; blood vessels bring oxygen and nutrients to the eyeball January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament choroid sclera rectus muscles
21.
Vertical Section of
The Human Eye Region where images are sharply focused January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament fovea (yellow spot) choroid sclera rectus muscles
22.
Vertical Section of
The Human Eye Transmit nerve impulses from eye to brain optic nerve January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. fovea (yellow spot) choroid sclera rectus muscles viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament
23.
Vertical Section of
The Human Eye Region over optic nerve; no photoreceptors, so insensitive to light blind spot January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament optic nerve fovea (yellow spot) choroid sclera rectus muscles
24.
Vertical Section of
The Human Eye Light-sensitive layer containing cones responsible for colour vision in bright light and rods responsible for vision in dim light retina January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. viterous humour ciliary body lens cornea pupil aqueous humour iris suspensory ligament blind spot optic nerve fovea (yellow spot) choroid sclera rectus muscles
25.
26.
Chapter 14 The
Human Eye Action of Iris in Bright Light January 11, 2010
27.
Action of Iris
in Bright Light January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Circular muscles of the iris contract 1
28.
Action of Iris
in Bright Light January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Radial muscles of the iris relax 2 Circular muscles of the iris contract 1
29.
Action of Iris
in Bright Light Pupil constricts and this reduces the amount of light entering the eye January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Radial muscles of the iris relax 2 Circular muscles of the iris contract 1 3
30.
Chapter 14 The
Human Eye Action of Iris in Dim Light January 11, 2010
31.
Action of Iris
in Dim Light January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Radial muscles of iris will contract Radial muscles of the iris contract 1
32.
Action of Iris
in Dim Light January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Radial muscles of the iris contract 1 Circular muscles of the iris relax 2
33.
Action of Iris
in Dim Light Pupil dilates and this increases the amount of light entering the eye January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Radial muscles of the iris contract 1 Circular muscles of the iris relax 2 3
34.
35.
36.
37.
38.
39.
40.
Chapter 14 The
Human Eye How Do We See? January 11, 2010
41.
How Do We
See? January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 1 Light rays are refracted through the cornea and the aqueous humour onto the lens object cornea lens aqueous humour
42.
How Do We
See? January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 1 2 The lens causes further refraction Light rays are refracted through the cornea and the aqueous humour onto the lens object cornea lens aqueous humour
43.
How Do We
See? January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 1 2 3 Rays converge to focus on retina The lens causes further refraction Light rays are refracted through the cornea and the aqueous humour onto the lens object cornea lens aqueous humour retina
44.
How Do We
See? January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 1 2 3 4 The image on the retina stimulates either the rods or the cones, depending on the intensity of the light Rays converge to focus on retina The lens causes further refraction Light rays are refracted through the cornea and the aqueous humour onto the lens object cornea lens aqueous humour retina image
45.
46.
47.
Chapter 14 The
Human Eye How Eyes Focus on Distant Objects January 11, 2010
48.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Parallel light rays from distant object enters eyes Vertical section of the eye 1
49.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Ciliary muscles relax Vertical section of the eye Enlarged portion of eye (front view) 1 2 2
50.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Suspensory ligaments become taut Vertical section of the eye Enlarged portion of eye (front view) 1 2 2 3 3
51.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Lens becomes thinner Vertical section of the eye Enlarged portion of eye (front view) 1 2 2 3 3 4 4
52.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Focal length increases Vertical section of the eye Enlarged portion of eye (front view) 1 2 2 3 3 4 5 4
53.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Light rays from distant object focused on retina 1 2 2 3 3 4 5 6 4
54.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated 7 1 2 2 3 3 4 5 6 4
55.
How Eyes Focus
on Distant Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated Nerve impulses produced by optic nerves 7 8 1 2 2 3 3 4 5 6 4
56.
How Eyes Focus
on Distant Objects Vertical section of the eye Enlarged portion of eye (front view) January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Photoreceptors stimulated Transmission of nerves to brain Nerve impulses produced by optic nerves 7 8 9 1 2 2 3 3 4 5 6 4
57.
How Eyes Focus
on Distant Objects Vertical section of the eye Enlarged portion of eye (front view) January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Photoreceptors stimulated Transmission of nerves to brain Brain interprets impulses Nerve impulses produced by optic nerves 7 8 9 10 1 2 2 3 3 4 5 6 4
58.
How Eyes Focus
on Distant Objects Photoreceptors stimulated Transmission of nerves to brain Vertical section of the eye Enlarged portion of eye (front view) Brain interprets impulses January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Person sees the distant object Nerve impulses produced by optic nerves 7 8 9 10 11 1 2 2 3 3 4 5 6 4
59.
60.
Chapter 14 The
Human Eye How Eyes Focus on Near Objects January 11, 2010
61.
How Eyes Focus
on Near Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Diverging light rays from near object enters eyes 1
62.
How Eyes Focus
on Near Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Ciliary muscles contract 2 2 1
63.
How Eyes Focus
on Near Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Suspensory ligaments become slacken 3 2 2 3 1
64.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Lens becomes thicker January 11, 2010 3 2 2 3 4 1 4
65.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Focal length decreases January 11, 2010 3 2 2 3 4 5 1 4
66.
How Eyes Focus
on Near Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Light rays from near object focused on retina 3 2 2 3 4 5 6 1 4
67.
How Eyes Focus
on Near Objects January 11, 2010 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated 3 2 2 3 4 5 6 1 7 4
68.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) January 11, 2010 Photoreceptors stimulated Nerve impulses produced by optic nerves 3 2 2 3 4 5 6 1 7 8 4
69.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated Nerve impulses produced by optic nerves January 11, 2010 Transmission of nerves to brain 3 2 2 3 4 5 6 1 7 8 9 4
70.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated January 11, 2010 Nerve impulses produced by optic nerves Transmission of nerves to brain Brain interprets impulses 3 2 2 3 4 5 6 1 7 8 9 10 4
71.
How Eyes Focus
on Near Objects Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Vertical section of the eye Enlarged portion of eye (front view) Photoreceptors stimulated January 11, 2010 Nerve impulses produced by optic nerves Transmission of nerves to brain Brain interprets impulses Person sees the near object 3 2 2 3 4 6 1 5 7 8 9 10 11 4
72.
73.
Vertical Section of
The Human Eye Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Pupil Reflex A reflex action in which the pupil changes size as a result of changes in light intensity.
74.
Vertical Section of
The Human Eye Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. Pupil Reflex In bright light
75.
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Notas del editor
Concept Map page 281
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Figure 14.5 (top) page 276
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