Ch 50 - Sensory and Motor Mechanisms (1 slide per page)

25 campbell 9th ed 49 typesofsensoryreceptors chemo

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Unformatted text preview: eceptors occur on extensions of dendrites (cilia) • Alike olfactory receptor neurons transmit to same region of olfactory bulb (in brain) Figure 50.25 (Campbell 9th ed.) 49 Types of Sensory Receptors Chemo Smell - In insects odorants pass into pores on hairs on antennae DEET blocks mosquito olfactory receptor that detects human scent 50 Types of Sensory Receptors Chemo Pheromones Sex pheromone receptor in male silkworms A secreted or excreted chemical factor that triggers a social response in members of the same species - sex, alarm, feeding… Figure 50.6 (Campbell 9th ed.) 51 Types of Sensory Receptors Electromagnetic Respond to: ‐ Electromagnetic energy ‐ light, electricity, magnetism 52 Types of Sensory Receptors Electromagnetic Pit organs Can detect radiant heat in the IR wavelengths Visible light http://upload.wikimedia.org/wikipedia/commons/4/47/The_Pit_Organs_of_Two_Different_Snakes.jpg 53 Types of Sensory Receptors Electromagnetic Ampullae of Lorenzini help elasmobranchs, sturgeon, etc hunt Navigation Electric fish: Navigation, object detection, and communication Platypus use 40K electroreceptors & 60K mechanoreceptors on their bill to hunt 55 Types of Sensory Receptors Electromagnetic Most animals have light‐detecting organ Simple eye cup Provides light intensity and direction but no images Figure 50.15 (Campbell 9th ed.) Planarian 56 Types of Sensory Receptors Electromagnetic → Vision Compound eyes • Many light detectors (ommatidium) - each sees a small part of field - each has its own lens - Rhabdom contains photoreceptor cells • Found in arthropods • Effective at detecting movement (6x more than human eye) Figure 50.16 (Campbell 9th ed.) 57 Insect Vision 58 Insect Vision Visible Light Evening primrose (Oenothera biennis) Dandelion (Taraxacum officinale) Wood anemone (Anemone nemorosa) UV Light 59 Types of Sensory Receptors Electromagnetic → Vision Single lens eyes Iris • Found in spiders, mollusks, jellies and vertebrates Retina Cornea • Pupil / iris regulate light intensity • Adjustable lens that focuses light onto retina Pupil • Cornea lets in light and acts as a fixed lens Lens Optic nerve • Retina contains light sensitive cells (photoreceptors) Figure 50.17(1) (Campbell 9th ed.) Vision 60 Single lens eyes In mammals, changes in lens shape finely focuses light Figure 50.22(Campbell 9th ed.) Due to misshapen cornea or eyeball Retina 61 2 types of light sensitive cells (photoreceptors): Rods – light‐sensitive; no colors Cones – less light‐sensitive; distinguish colors Humans 125 mil...
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