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11 Cards in this Set
- Front
- Back
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Iris
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-Thin diaphragm of smooth muscle
-Opens and closes the pupil - Pigments = Eye color |
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Lens
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-Composed of compact layers of protein -Attached to the ciliary muscle (a ring of smooth muscle) which changes the lens shape
-Bends and brings light into focus on retina |
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Retina
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-Light rays pass through the pupil and the lens and are focused on the retina
-Has three layers:T -he outermost layer contains photoreceptors – rod cells and cone cells -The middle layer contains bipolar cells -The innermost layer contains ganglion cells -Rod and cone cells synapse with the bipolar cells, which in turn synapse with ganglion cells responsible for initiating nerve impulses |
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Rods
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-Permit vision in low light by rhodopsins, light-sensitive membrane proteins
-Used in peripheral vision and motion |
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Cones
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-Permit vision in bright light
-Responsible for color vision and fine details |
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Tympanum
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insects -a membrane stimulated to vibrate by sound waves that directly activates nerve impulses in attached receptor cells |
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lateral line system
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fish -detects water currents and pressure waves from nearby objects, helping the organism guide their movement and locate other fish |
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The human ear
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-The outer ear – the pinna and the auditory canal -The middle ear
- Begins at the tympanic membrane and ends at the oval and round windows |
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The ossicles
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-The three small bones found between the tympanic membrane and the windows
-The malleus (hammer), the incus (anvil), and the stapes (stirrup) |
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auditory tube
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extends from middle ear to the throat
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statocysts
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to determine the position of their heads
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