BI 451 FINAL EXAM.pdf

Chapters 9-10 : sensory Physiology Sensory Perception : Spatial scale & Signal dispersal fields from prey : e Vision and The Photoreception fish eye : variations in functions and structure : continuously grows throughout life . a body size Eye size correlates Designed for sensitiv...

Chapters 9-10 : sensory Physiology Sensory Perception : Spatial scale & Signal dispersal fields from prey : e Vision and The Photoreception fish eye : variations in functions and structure : continuously grows throughout life . a body size Eye size correlates Designed for sensitivity we Detection threshold clarity Acuity throughout life of vision sharpness RESOLUTION functions I capture the light 2 focus 3 Transform the image on the retina image Light Penetration and into neural + Signals integrate process by brain Spectrum factors Turbidity i depth Spectral changes Absorption : by water , preference for red light scattering , additional reflection : coastal water . Poor depth penetration Algae : Absorb . green blue and red is . reflected light Why are so many deep sea fishes red ? red fish only red at surface - a depth Black bic no red light pigmentation costs to fisheye components - eye is , on retina needs to Image forming I refraction : bending of light as it passes through different densities allows FOCUS hemispheric refract corned 2 Iris : control amount of light entering 3 Lens : Intraocular 4 Retina : light detection . 5 choroid : O2 delivery 6 Falciform process : Of delivery . focusing Transduction Sclerd : Eyeball , - Located the eye to nerve signals behind retina On top of retina connective +issue , structure , whites corned Retind Outermost transparent layer conjuctiva and for light Detection sciera Thin , transparent , laminar Thinner in fish Back of eye refraction little between cornea water + Overlayer - B/C of eyes Density between corned + water is small pigmented epithelium light after it passes photo receptors absorb . Lens (much more spherical than human must refract Spherical - light to focus light On for refraction bonyfish and in Slightly flattened in Distance between (near + far field lens lens) photo receptors detect light retina lamprey & elasmobranchs + . - retina varies vision Sclerd Outer layer . connective tissue agnathans fibrous sciera in cartilagenous sciera in chondrichthyans Inner . Teleosts have Sclerotic bones choroid Nuclei of highly vascularized reflects light passing through back retina reflective guanine crystals to reflect shine Layer (OPTIC NERVE Nerves . Nervous +issue in sharks + Send photo receptors optic lobe of brain for processing nocturnal fish Falciform process also vascularized but over retina . Eye oc demanding Eye . Root shift RETEMIRABLE : Enhance Of delivery to " O2 unloading