Sense organs Lab 12.

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Presentation transcript:

Sense organs Lab 12

Animal eyes Invertebrate eyes: compound eye (eg. arthropods) camera-type eye (eg. squid) Vertebrate eyes:

© Lennart Nilsson, from The Incredible Machine Photoreceptors Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. ion channels close membrane of disk cascade of reactions rod cell light rays outer segment cone cell ion channels in plasma membrane retinal inner segment cell body opsin nucleus Membrane of disk Rhodopsin molecule (opsin + retinal) synaptic vesicles 20 µm synaptic endings © Lennart Nilsson, from The Incredible Machine

b: © Biophoto Associates/Photo Researchers, Inc. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. sclera choroid rod cell and cone cell layer a. Location of retina bipolar cell layer retina optic nerve ganglion cell layer axons of ganglion cells b. Micrograph of retina blind spot to optic nerve light rays b: © Biophoto Associates/Photo Researchers, Inc.

Animal ears Detecting sound waves Organs of balance

Human Skin The receptors in human skin a sensitive to touch, pain, temperature, and pressure.

Dissect cow eyes and identify the three layers and the related structures

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