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L7 Skin II - Fish 1 Unicellular abundant mucous glands in...

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Unformatted text preview: Fish 1. Unicellular - abundant mucous glands in epidermis. • maintains stable internal environment • protects from bacteria, ectoparasites • reduces drag when swimming Some glands (granular) secrete pheromones when fish injured, triggers reaction in nearby fish Glands No dead, keratinised cells except for horny teeth of lampreys and nuptial tubercles 2. Multicellular (dermal) • large slime glands in hagfish • poison glands (spines) • light generating glands Flashlight fish – contains symbiotic bacteria, shutter mechanism Flatfish camouflage operates through visual system (blinded fish go dark) but still uses sympathetic ns & MSH to alter chromatophore units Bony scales Same as bone in mammals, osteocytes, lacunae, canaliculi, hydroxyapatite mineral, teleosts have acellular bone. Dentine and enamel layers on top of bone • ameloblasts form enamel organ = enamel = epidermal • odontoblasts = dentine = dermal Enamel, hardest tissue in body, 96% hydroxyapatite Shark has vascular cavity,...
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L7 Skin II - Fish 1 Unicellular abundant mucous glands in...

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